SIPPING Working Group A. Johnston
Internet-Draft WorldCom
Expires: August 2, 2003 R. Sparks
C. Cunningham
S. Donovan
dynamicsoft
K. Summers
Sonus
February 2003
Session Initiation Protocol Service Examples
draft-ietf-sipping-service-examples
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that other
groups may also distribute working documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at http://
www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This Internet-Draft will expire on August 2, 2003.
Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This informational document gives examples of Session Initiation
Protocol (SIP) services. This covers most features offered in
so-called Centrex offerings from local exchange carriers and PBX
(Private Branch Exchange) features. Most of the services shown in
this document are implemented in the SIP User Agents, although some
require the assistance of a SIP Proxy. Some require some extensions
to SIP including the REFER, SUBSCRIBE, and NOTIFY methods and the
Johnston, et al. Expires August 2, 2003 [Page 1]
Internet-Draft SIP Service Examples February 2003
Replaces and Join headers. These features are not intended to be an
exhaustive set, but rather show implementations of common features
likely to be implemented on SIP IP telephones in a business
environment.
Table of Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Legend for Message Flows . . . . . . . . . . . . . . . . . . 4
2. Service Examples . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Call Hold . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Consultation Hold . . . . . . . . . . . . . . . . . . . . . 15
2.3 Music On Hold . . . . . . . . . . . . . . . . . . . . . . . 31
2.4 Unattended Transfer . . . . . . . . . . . . . . . . . . . . 38
2.5 Attended Transfer . . . . . . . . . . . . . . . . . . . . . 45
2.6 Call Forwarding Unconditional . . . . . . . . . . . . . . . 58
2.7 Call Forwarding - Busy . . . . . . . . . . . . . . . . . . . 64
2.8 Call Forwarding - No Answer . . . . . . . . . . . . . . . . 70
2.9 3-way Conference Third Party is Added . . . . . . . . . . 79
2.10 3-way Conference Third Party Joins . . . . . . . . . . . . 85
2.11 Single Line Extension . . . . . . . . . . . . . . . . . . . 90
2.12 Find-Me . . . . . . . . . . . . . . . . . . . . . . . . . . 107
2.13 Call Management (Incoming Call Screening) . . . . . . . . . 118
2.14 Call Management (Outgoing Call Screening) . . . . . . . . . 122
2.15 Call Park . . . . . . . . . . . . . . . . . . . . . . . . . 125
2.16 Call Pickup . . . . . . . . . . . . . . . . . . . . . . . . 133
2.17 Automatic Redial . . . . . . . . . . . . . . . . . . . . . . 140
2.18 Click to Dial . . . . . . . . . . . . . . . . . . . . . . . 147
3. Security Considerations . . . . . . . . . . . . . . . . . . 150
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . 150
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 150
6. Document History . . . . . . . . . . . . . . . . . . . . . . 151
6.1 Changes since -03 . . . . . . . . . . . . . . . . . . . . . 151
Informative References . . . . . . . . . . . . . . . . . . . 151
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . 152
Intellectual Property and Copyright Statements . . . . . . . 154
Johnston, et al. Expires August 2, 2003 [Page 2]
Internet-Draft SIP Service Examples February 2003
1. Overview
This informational document provides call flows detailing a SIP
implementation of the following traditional telephony services:
Call Hold Music on Hold
Unattended Transfer Consultation Hold
Unconditional Call Forwarding Attended Transfer
No Answer Call Forwarding Busy Call Forwarding
Single-Line Extension 3-way Call
Incoming Call Screening Find-Me
Call Pickup Call Park
Outgoing Call Screening Automatic Redial
Click to Dial
It is the hope of the authors that this document will be useful for
SIP implementors, users, designers, and protocol researchers alike
and will help further the goal of a standard SIP implementation for
IP Telephony. It is envisioned that as changes to the standard and
additional RFCs are added that this document will reflect those
changes and represent the current state of a standard SIP IP
Telephony implementation.
These flows use SIP as defined by RFC 2543bis [2] and [8]. Note that
this document is informational, and nothing stated here should be
taken as normative. The SIP specification and the other referenced
documents are definitive as far as protocol issues are concerned.
Also, these flows do not represent the only way to implement these
services - other approaches such as 3pcc (Third Party Call Control)
or Back-to-Back User Agents (B2BUA) may be more appropriate in some
circumstances. The design and principles of these service examples
are described in the the Multiparty Framework document [12].
These flows assume the functionality described in the SIP Call Flow
Examples document [3], which explores basic behavior and PSTN
internetworking. Some of the scenarios described herein make use of
the SIP method extension REFER [4] and the SIP header extension
Replaces [5], the SIP header extension Join [6], and some of the
concepts in the 3pcc (third party call control) document [7]. The
SIP Events document [11] describes the use of SUBSCRIBE and NOTIFY
while the SIP Call Package document [10] describes the dialog event
package.
These flows were prepared assuming a network of proxies, registrars,
PSTN gateways, and other SIP servers that have a pre-established
trust relationship with each other, secured through other means than
SIP. User agents wishing to use the services in this network are
Johnston, et al. Expires August 2, 2003 [Page 3]
Internet-Draft SIP Service Examples February 2003
required to authenticate themselves with an edge proxy using SIP
Digest. To improve the clarity of this document, authentication of
User Agents is not explicitly shown in all flows, except where
authentication directly relates to the service example.
Each call flow is presented with a textual description of the
scenario, a message flow diagram showing the messages exchanged
between separate network elements, and the detailed contents of each
message shown in the diagram.
1.1 Legend for Message Flows
Dashed lines (---) represent control messages that are mandatory to
the call scenario. These control messages can be SIP or PSTN
signaling.
Double dashed lines (===) represent media paths between network
elements.
Messages with parenthesis around name represent optional control
messages.
Messages are identified in the Figures as F1, F2, etc. This
references the message details in the table that follows the Figure.
Comments in the message details are shown in the following form:
/* Comments. */
2. Service Examples
2.1 Call Hold
Alice Proxy Bob
| | |
| INVITE F1 | |
|--------------->| |
| | INVITE F2 |
|(100 Trying) F3 |------------->|
|<---------------| |
| |180 Ringing F4|
| 180 Ringing F5 |<-------------|
|<---------------| |
| | 200 OK F6 |
| 200 OK F7 |<-------------|
|<---------------| |
| ACK F8 | |
|--------------->| ACK F9 |
Johnston, et al. Expires August 2, 2003 [Page 4]
Internet-Draft SIP Service Examples February 2003
| |------------->|
| Both way RTP Established |
|<=============================>|
| |INVITE(hold) F10
|INVITE(hold) F11|<-------------|
|<---------------| |
| 200 OK F12 | |
|--------------->| 200 OK F13 |
| |------------->|
| | ACK F14 |
| ACK F15 |<-------------|
|<---------------| |
| No RTP Sent! |
| | INVITE F16 |
| INVITE F17 |<-------------|
|<---------------| |
| 200 OK F18 | |
|--------------->| 200 OK F19 |
| |------------->|
| | ACK F20 |
| ACK F21 |<-------------|
|<---------------| |
| Both way RTP Established |
|<=============================>|
| BYE F22 | |
|--------------->| BYE F23 |
| |------------->|
| | 200 OK F24 |
| 200 OK F25 |<-------------|
|<---------------| |
| | |
Alice calls Bob, then places the call on hold. Bob then takes call
off hold. Alice hangs up call. Hold is unidirectional in nature.
However, a UA that places the other party on hold will generally also
stop sending media, resulting in no media exchange between the UAs.
Message Details
F1 INVITE Alice -> Proxy 1
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345601@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 5]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 INVITE Proxy 1 -> Bob
INVITE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F3 (100 Trying) Proxy 1 -> Alice
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Johnston, et al. Expires August 2, 2003 [Page 6]
Internet-Draft SIP Service Examples February 2003
Content-Length: 0
F4 180 Ringing Bob -> Proxy 1
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content Length:0
F5 180 Ringing Proxy 1 -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content Length: 0
F6 200 OK Bob -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
Johnston, et al. Expires August 2, 2003 [Page 7]
Internet-Draft SIP Service Examples February 2003
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F7 200 OK Proxy 1 -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F8 ACK Alice -> Proxy 1
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F9 ACK Proxy 1 -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Johnston, et al. Expires August 2, 2003 [Page 8]
Internet-Draft SIP Service Examples February 2003
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Bob places Alice on hold. Note that the version is
incremented in the o= field of the SDP */
F10 INVITE Bob -> Proxy 1
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
F11 INVITE Proxy 1 -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Johnston, et al. Expires August 2, 2003 [Page 9]
Internet-Draft SIP Service Examples February 2003
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
/* A replies to hold */
F12 200 OK Alice -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
F13 200 OK Proxy 1 -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Johnston, et al. Expires August 2, 2003 [Page 10]
Internet-Draft SIP Service Examples February 2003
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
F14 ACK Bob -> Proxy 1
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F15 ACK Proxy 1 -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Bob takes the call off hold */
Johnston, et al. Expires August 2, 2003 [Page 11]
Internet-Draft SIP Service Examples February 2003
F16 INVITE Bob -> Proxy 1
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F17 INVITE Proxy 1 -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 12]
Internet-Draft SIP Service Examples February 2003
F18 200 OK Alice -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F19 200 OK Proxy 1 -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 13]
Internet-Draft SIP Service Examples February 2003
F20 ACK Bob -> Proxy 1
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 2 ACK
Content-Length: 0
F21 ACK Proxy 1 -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 2 ACK
Content-Length: 0
/* RTP Media stream re-established. Alice disconnects. */
F22 BYE Alice -> Proxy 1
BYE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F23 BYE Proxy 1 -> Bob
BYE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Johnston, et al. Expires August 2, 2003 [Page 14]
Internet-Draft SIP Service Examples February 2003
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F24 200 OK Bob -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F25 200 OK Proxy 1 -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
2.2 Consultation Hold
Alice Proxy Bob Carol
| | | |
| INVITE F1 | | |
|--------------->| INVITE F2 | |
| |------------->| |
|(100 Trying) F3 | | |
|<---------------|180 Ringing F4| |
| |<-------------| |
| 180 Ringing F5 | | |
Johnston, et al. Expires August 2, 2003 [Page 15]
Internet-Draft SIP Service Examples February 2003
|<---------------| 200 OK F6 | |
| |<-------------| |
| 200 OK F7 | | |
|<---------------| | |
| ACK F8 | | |
|--------------->| ACK F9 | |
| |------------->| |
| Both way RTP Established | |
|<=============================>| |
| |INVITE(hold) F10 |
|INVITE(hold) F11|<-------------| |
|<---------------| | |
| 200 OK F12 | | |
|--------------->| 200 OK F13 | |
| |------------->| |
| | ACK F14 | |
| |<-------------| |
| ACK F15 | | |
|<---------------| | |
| No RTP Sent! | |
| | INVITE F16 | |
| |<-------------| |
| | | INVITE F17 |
| |--------------------------------->|
| |(100 Trying) F18 |
| |------------->| |
| | | 180 Ringing F19 |
| |<---------------------------------|
| | 180 Ringing F20 |
| |------------->| |
| | | 200 OK F21 |
| |<---------------------------------|
| | 200 OK F22 | |
| |------------->| |
| | ACK F23 | |
| |<-------------| |
| | | ACK F24 |
| |--------------------------------->|
| | Both way RTP Established |
| | |<=================>|
| | BYE F25 | |
| |<-------------| |
| | | BYE F26 |
| |--------------------------------->|
| | | 200 OK F27 |
| |<---------------------------------|
| | 200 OK F28 | |
| |------------->| |
Johnston, et al. Expires August 2, 2003 [Page 16]
Internet-Draft SIP Service Examples February 2003
| | INVITE F29 | |
| INVITE F30 |<-------------| |
|<---------------| | |
| 200 OK F31 | | |
|--------------->| 200 OK F32 | |
| |------------->| |
| | ACK F33 | |
| |<-------------| |
| ACK F34 | | |
|<---------------| | |
| Both way RTP Established | |
|<=============================>| |
| BYE F35 | | |
|--------------->| BYE F36 | |
| |------------->| |
| | 200 OK F37 | |
| |<-------------| |
| 200 OK F38 | | |
|<---------------| | |
| | | |
Alice calls Bob. Bob places call on hold. Bob calls Carol. Bob then
disconnects with Carol, then takes the call with Alice off hold. The
call ends when Bob hangs up.
Message Details
F1 INVITE Alice -> Proxy 1
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 17]
Internet-Draft SIP Service Examples February 2003
F2 INVITE Proxy 1 -> Bob
INVITE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F3(100 Trying) Proxy 1 -> Alice
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F4 180 Ringing Bob -> Proxy 1
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 18]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content Length:0
F5 180 Ringing Proxy 1 -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content Length: 0
F6 200 OK Bob -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F7 200 OK Proxy 1 -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Johnston, et al. Expires August 2, 2003 [Page 19]
Internet-Draft SIP Service Examples February 2003
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F8 ACK Alice -> Proxy 1
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F9 ACK Proxy 1 -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Bob places Alice on hold. */
Johnston, et al. Expires August 2, 2003 [Page 20]
Internet-Draft SIP Service Examples February 2003
F10 INVITE Bob -> Proxy 1
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
F11 INVITE Proxy 1 -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
Johnston, et al. Expires August 2, 2003 [Page 21]
Internet-Draft SIP Service Examples February 2003
F12 200 OK Alice -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
F13 200 OK Proxy 1 -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
Johnston, et al. Expires August 2, 2003 [Page 22]
Internet-Draft SIP Service Examples February 2003
F14 ACK Bob -> Proxy 1
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F15 ACK Proxy 1 -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F16 INVITE Bob -> Proxy 1
INVITE sip:carol@chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>
Call-ID: 9876543210@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844834 2890844834 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 50170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 23]
Internet-Draft SIP Service Examples February 2003
F17 INVITE Proxy 1 -> Carol
INVITE sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>
Call-ID: 9876543210@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844834 2890844834 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 50170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F18 (100 Trying) Proxy 1 -> Bob
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>
Call-ID: 9876543210@biloxi.example.com
CSeq: 1 INVITE
Content-Length: 0
F19 180 Ringing Carol -> Proxy 1
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 24]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Content Length:0
F20 180 Ringing Proxy 1 -> Bob
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=client.chicago.example.com
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Content Length: 0
F21 200 OK Carol -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F22 200 OK Proxy 1 -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Johnston, et al. Expires August 2, 2003 [Page 25]
Internet-Draft SIP Service Examples February 2003
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F23 ACK Bob -> Proxy 1
ACK sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 1 ACK
Content-Length: 0
F24 ACK Proxy 1 -> Carol
ACK sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 1 ACK
Content-Length: 0
F25 BYE Bob -> Proxy 1
Johnston, et al. Expires August 2, 2003 [Page 26]
Internet-Draft SIP Service Examples February 2003
BYE sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 2 BYE
Content-Length: 0
F26 BYE Proxy 1 -> Carol
BYE sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 2 BYE
Content-Length: 0
F27 200 OK Carol -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 2 BYE
Content-Length: 0
F28 200 OK Proxy 1 -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=456654
Call-ID: 9876543210@biloxi.example.com
CSeq: 2 BYE
Johnston, et al. Expires August 2, 2003 [Page 27]
Internet-Draft SIP Service Examples February 2003
Content-Length: 0
/* Bob takes the call off hold */
F29 INVITE Bob -> Proxy 1
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F30 INVITE Proxy 1 -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
Johnston, et al. Expires August 2, 2003 [Page 28]
Internet-Draft SIP Service Examples February 2003
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F31 200 OK Alice -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F32 200 OK Proxy 1 -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Record-Route: <sip:ss1.example.com;lr>
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 29]
Internet-Draft SIP Service Examples February 2003
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F33 ACK Bob -> Proxy 1
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 2 ACK
Content-Length: 0
F34 ACK Proxy 1 -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 2 ACK
Content-Length: 0
F35 BYE Alice -> Proxy 1
BYE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F36 BYE Proxy 1 -> Bob
BYE sip:bob@client.biloxi.example.com SIP/2.0
Johnston, et al. Expires August 2, 2003 [Page 30]
Internet-Draft SIP Service Examples February 2003
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F37 200 OK Bob -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F38 200 OK Proxy 1 -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
2.3 Music On Hold
Alice Bob Music Server
| | |
| INVITE F1 | |
|--------------->| |
| 180 Ringing F2 | |
|<---------------| |
| 200 OK F3 | |
|<---------------| |
Johnston, et al. Expires August 2, 2003 [Page 31]
Internet-Draft SIP Service Examples February 2003
| ACK F4 | |
|--------------->| |
| RTP | |
|<==============>| |
| | |
| B places A on hold with music |
| | |
| | INVITE no sdp F5
| |------------->|
| |200 OK sdpM F6|
| |<-------------|
|INVITE (hold) F7| |
|<---------------| |
| 200 OK sdpA F8 | |
|--------------->| |
| ACK F9 | |
|<---------------| |
| | ACK sdpA F10 |
| |------------->|
| RTP |
|<==============================|
| | |
| B Picks up the Call |
| | BYE F11 |
| |------------->|
| | 200 OK F12 |
| |<-------------|
| INVITE F13 | |
|<---------------| |
| 200 OK F14 | |
|--------------->| |
| ACK F15 | |
|<---------------| |
| RTP | |
|<==============>| |
In this flow,B places A on hold with music. This is performed by B
acting as a B2BUA (Back-to-Back User Agent) using 3pcc (third party
call control) [7] to INVITE a Music Server into the session, which
sends RTP music to A. B picks the call up from hold by sending a BYE
to the music server and taking A off of hold.
Note that if A responds to the INVITE with hold SDP with hold SDP in
the 200 OK, this call flow will not work properly.
Note also that A will receive RTP packets from two different IP
addresses during this call flow.
Johnston, et al. Expires August 2, 2003 [Page 32]
Internet-Draft SIP Service Examples February 2003
Message Details
F1 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 180 Ringing Bob -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F3 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Johnston, et al. Expires August 2, 2003 [Page 33]
Internet-Draft SIP Service Examples February 2003
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F4 ACK Alice -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Bob places A on hold with music by acting as a B2BUA and sending an INVITE to the Music Server */
F5 INVITE Bob -> Music Server
INVITE sip:music@server.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Music <sip:music@server.example.com>
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F6 200 OK Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Music <sip:music@server.example.com>;tag=90210
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 1 INVITE
Johnston, et al. Expires August 2, 2003 [Page 34]
Internet-Draft SIP Service Examples February 2003
Contact: <sip:music@server.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=MusicServer 2890844576 2890844577 IN IP4 music.server.example.com
s=Session SDP
c=IN IP4 music.server.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
/* B re-INVITEs A on hold */
F7 INVITE Bob -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844528 IN IP4 music.server.example.com
s=Session SDP
c=IN IP4 music.server.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
F8 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
From: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.atlanta.example.com>
Johnston, et al. Expires August 2, 2003 [Page 35]
Internet-Draft SIP Service Examples February 2003
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
F9 ACK Bob -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* B passes SDP of A to the Music Server to allow music to be sent from B to A */
F10 ACK Bob -> Music Server
ACK sip:music@server.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Music <sip:music@server.example.com>;tag=90210
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 1 ACK
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
Johnston, et al. Expires August 2, 2003 [Page 36]
Internet-Draft SIP Service Examples February 2003
/* RTP music is now sent from the Music Server to A */
/* B picks up the call from the Music Server */
F11 BYE Bob -> Music Server
BYE sip:music@server.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Music <sip:music@server.example.com>;tag=90210
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 2 BYE
Content-Length: 0
F12 200 OK Music Server -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Music <sip:music@server.example.com>;tag=90210
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 2 BYE
Content-Length:0
/* B re-INVITEs taking A off hold */
F13 INVITE Bob -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
Johnston, et al. Expires August 2, 2003 [Page 37]
Internet-Draft SIP Service Examples February 2003
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F14 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
From: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:bob@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F15 ACK Bob -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 2 ACK
Content-Length: 0
/* Normal media session between A and B is resumed */
2.4 Unattended Transfer
Johnston, et al. Expires August 2, 2003 [Page 38]
Internet-Draft SIP Service Examples February 2003
Alice Bob Carol
| INVITE F1 | |
|<-------------------| |
| 180 Ringing F2 | |
|------------------->| |
| 200 OK F3 | |
|------------------->| |
| ACK F4 | |
|<-------------------| |
| RTP | |
|<==================>| |
| | |
| A performs unattended transfer |
| | |
| REFER Refer-To:C F5| |
|------------------->| |
| 202 Accepted F6 | |
|<-------------------| |
| NOTIFY F7 | |
|<-------------------| |
| 200 OK F8 | |
|------------------->| |
| BYE F9 | |
|------------------->| |
| 200 OK F10 | |
|<-------------------| |
| No RTP Session | INVITE Referred-By: A F11
| |------------------->|
| | 180 Ringing F12 |
| |<-------------------|
| | 200 OK F13 |
| |<-------------------|
| | ACK F14 |
| |------------------->|
| | RTP |
| |<==================>|
| NOTIFY F14 | |
|<-------------------| |
| 200 OK F15 | |
|------------------->| |
| | |
Bob calls Alice. Alice then transfers Bob to Carol, then Alice
disconnects with Bob. Bob establishes the session to Carol then
reports the success back to Alice in the NOTIFY. If the transfer
fails, Bob can send a new INVITE back to Alice to re-establish the
session.
Johnston, et al. Expires August 2, 2003 [Page 39]
Internet-Draft SIP Service Examples February 2003
Note that the BYE could be sent by Alice after the NOTIFY. Also, if
Alice has flushed all state information, the NOTIFY may receive a 481
Call Leg Does Not Exist.
Message Details
F1 INVITE Bob -> Alice
INVITE sip:alice@atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 180 Ringing Alice -> Bob
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Length: 0
F3 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
Johnston, et al. Expires August 2, 2003 [Page 40]
Internet-Draft SIP Service Examples February 2003
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F4 ACK Bob -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Session is established between Alice and Bob. */
/* Alice peforms unattended transfer of Bob to Carol */
F5 REFER Alice -> Bob
REFER sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 2 REFER
Refer-To: <sip:carol@chicago.example.com>
Referred-By: <alice@atlanta.example.com>
Contact: <sip:alice@client.atlanta.example.com>
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 41]
Internet-Draft SIP Service Examples February 2003
F6 202 Accepted Bob -> Alice
SIP/2.0 202 Accepted
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 2 REFER
Content-Length: 0
F7 NOTIFY Bob -> Alice
NOTIFY sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 2 NOTIFY
Event: refer
Subscription-State: active;expires=60
Content-Type: message/sipfrag
Content-Length: ...
SIP/2.0 100 Trying
F8 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 2 NOTIFY
Content-Length: 0
/* Alice now disconnects with Bob. */
F9 BYE Alice -> Bob
BYE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Johnston, et al. Expires August 2, 2003 [Page 42]
Internet-Draft SIP Service Examples February 2003
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 3 BYE
Content-Length: 0
F10 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 3 BYE
Content-Length: 0
/* Bob attempts the transfer to Carol */
F11 INVITE Bob -> Carol
INVITE sip:carol@chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>
Call-ID: 7436222@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Referred-By: <alice@atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844539 2890844539 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423821 0
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F12 180 Ringing Carol -> Bob
Johnston, et al. Expires August 2, 2003 [Page 43]
Internet-Draft SIP Service Examples February 2003
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=928287
Call-ID: 7436222@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Content-Length: 0
F13 200 OK Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=928287
Call-ID: 7436222@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844527 2890844527 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F14 ACK Bob -> Carol
ACK sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=928287
Call-ID: 7436222@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Bob and Carol now have established a session. Bob reports success to Alice which Alice probably ignores. */
Johnston, et al. Expires August 2, 2003 [Page 44]
Internet-Draft SIP Service Examples February 2003
F15 NOTIFY Bob -> Alice
NOTIFY sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 3 NOTIFY
Event: refer
Subscription-State: terminated;reason=noresource
Content-Type: message/sipfrag
Content-Length: ...
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=928287
Call-ID: 7436222@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Content-Type: application/sdp
Content-Length: ...
F16 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 3 NOTIFY
Content-Length: 0
2.5 Attended Transfer
Alice Bob Carol
| | |
| INVITE F1 | |
|--------------->| |
| 180 Ringing F2 | |
|<---------------| |
Johnston, et al. Expires August 2, 2003 [Page 45]
Internet-Draft SIP Service Examples February 2003
| 200 OK F3 | |
|<---------------| |
| ACK F4 | |
|--------------->| |
| RTP | |
|<==============>| |
|INVITE (hold) F5| |
|<---------------| |
| 200 OK F6 | |
|--------------->| |
| ACK F7 | |
|<---------------| |
| No RTP | |
| | INVITE F8 |
| |------------->|
| | 180 Ringing F9
| |<-------------|
| | 200 OK F10 |
| |<-------------|
| | ACK F11 |
| |------------->|
| | RTP |
| |<============>|
| |INVITE (hold) F12
| |------------->|
| | 200 OK F13 |
| |<-------------|
| | ACK F14 |
| |------------->|
| | No RTP |
| REFER Refer-To: C F15 |
|<---------------| |
|202 Accepted F16| |
|--------------->| |
| NOTIFY F17 | |
|--------------->| |
| 200 OK F18 | |
|<---------------| |
| INVITE Replaces: B F19 |
|------------------------------>|
| 200 OK F20 |
|<------------------------------|
| ACK F21 |
|------------------------------>|
| RTP |
|<=============================>|
| | BYE F22 |
| |<-------------|
Johnston, et al. Expires August 2, 2003 [Page 46]
Internet-Draft SIP Service Examples February 2003
| | 200 OK F23 |
| |------------->|
| NOTIFY F24 | |
|--------------->| |
| 200 OK F25 | |
|<---------------| |
| BYE F26 | |
|<---------------| |
| 200 OK F27 | |
|--------------->| |
Alice calls Bob. Bob puts Alice on hold then calls Carol to announce
transfer, then places Carol on hold. Bob transfers Alice to Carol
which replaces the session between Bob and Carol. Carol then
disconnects session with Bob. Alice reports success of transfer to
Bob, who then disconnects with Alice. In this example, the Replaces
header [5] is inserted into the Refer-To URL by Bob. Note that the
Refer-To URI is the Contact URI returned by Carol in the 200 OK
response F10. This ensures that only the correct instance of Carol
is reached. If the triggered INVITE had failed, Bob would have
retried the REFER with a Refer-To URI of the URI used to reach Carol
but with a Require: replaces header escaped in the Refer-To header
field, as discussed in [9].
Message Details
F1 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
Johnston, et al. Expires August 2, 2003 [Page 47]
Internet-Draft SIP Service Examples February 2003
a=rtpmap:0 PCMU/8000
F2 180 Ringing Bob -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F3 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F4 ACK Alice -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 48]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 ACK
Content-Length: 0
/* Alice and Bob have established a session. Bob puts Alice on Hold */
F5 INVITE Bob -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1024 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Length: ...
v=0
o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
F6 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1024 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 49]
Internet-Draft SIP Service Examples February 2003
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
F7 ACK Bob -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1024 ACK
Content-Length: 0
/* Bob calls Carol */
F8 INVITE Bob -> Carol
INVITE sip:carol@chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 42 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 28908445834 2890844834 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423645 0
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F9 180 Ringing Carol -> Bob
Johnston, et al. Expires August 2, 2003 [Page 50]
Internet-Draft SIP Service Examples February 2003
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 42 INVITE
Contact: <sip:carol@client.chicago.example.com>
Content-Length: 0
F10 200 OK Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 42 INVITE
Contact: <sip:carol@client.chicago.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F11 ACK Bob -> Carol
ACK sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 42 ACK
Content-Length: 0
/* Bob puts Carol on hold */
Johnston, et al. Expires August 2, 2003 [Page 51]
Internet-Draft SIP Service Examples February 2003
F12 INVITE Bob -> Carol
INVITE sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 43 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 289084834 2890844835 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423645 0
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
F13 200 OK Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 43 INVITE
Contact: <sip:carol@client.chicago.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844922 2890844923 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
Johnston, et al. Expires August 2, 2003 [Page 52]
Internet-Draft SIP Service Examples February 2003
F14 ACK Bob -> Carol
ACK sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 43 ACK
Content-Length: 0
/* Bob Transfers Alice to Carol. */
F15 REFER Bob -> Alice
REFER sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345678900@atlanta.example.com
CSeq: 1025 REFER
Refer-To: <sip:carol@client.chicago.example.com?Replaces=
sdjfdjfskdf@biloxi.example.com%3Bto-tag%3D5f35a3%3Bfrom-tag%3D8675309>
Referred-By: <sip:bob@biloxi.example.com>
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F16 202 Accepted Alice -> Bob
SIP/2.0 202 Accepted
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=1234567
To: Alice <sip:alice@atlanta.example.com>;tag=23431
Call-ID: 12345678900@atlanta.example.com
CSeq: 1025 REFER
Content-Length: 0
F17 NOTIFY Alice -> Bob
NOTIFY sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
Johnston, et al. Expires August 2, 2003 [Page 53]
Internet-Draft SIP Service Examples February 2003
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345678900@atlanta.example.com
CSeq: 2 NOTIFY
Event: refer
Subscription-State: active;expires=60
Content-Type: message/sipfrag
Content-Length: ...
SIP/2.0 100 Trying
F18 200 OK Bob -> Carol
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
To: Bob <sip:bob@biloxi.example.com>;tag=1234567
From: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: 12345678900@atlanta.example.com
CSeq: 2 NOTIFY
Content-Length: 0
/* Alice establishes session with Carol which replaces the session between Bob and Carol */
F19 INVITE Alice -> Carol
INVITE sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bKadfe4ko
To: Carol <sip:carol@client.chicago.example.com>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=3461
Call-ID: 9435674543@atlanta.example.com
CSeq: 1 INVITE
Referred-By: <sip:bob@biloxi.example.com>
Replaces: 12345600@atlanta.example.com;to-tag=23431;from-tag=8675309
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844989 2890844989 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423643 0
Johnston, et al. Expires August 2, 2003 [Page 54]
Internet-Draft SIP Service Examples February 2003
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F20 200 OK Carol -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bKadfe4ko
;received=192.0.2.123
To: Carol <sip:carol@client.chicago.example.com>;tag=ff3a
From: Alice <sip:alice@atlanta.example.com>;tag=3461
Call-ID: 9435674543@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844221 2890844221 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423452 0
m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F21 ACK Alice -> Carol
ACK sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bKadfe4ko
To: Carol <sip:carol@client.chicago.example.com>;tag=ff3a
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=3461
Call-ID: 9435674543@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
/* Carol then disconnects from Bob */
F22 BYE Carol -> Bob
BYE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
To: Bob <sip:bob@biloxi.example.com>;tag=8675309
Max-Forwards: 70
Johnston, et al. Expires August 2, 2003 [Page 55]
Internet-Draft SIP Service Examples February 2003
From: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 1 BYE
Content-Length: 0
F23 200 OK Bob -> Carol
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
To: Bob <sip:bob@biloxi.example.com>;tag=8675309
From: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 1 BYE
Content-Length: 0
/* Alice tells Bob that the call has been successfully transferred */
F24 NOTIFY Alice -> Bob
NOTIFY sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345678900@atlanta.example.com
CSeq: 3 NOTIFY
Event: refer
Subscription-State: terminated;reason=noresource
Content-Type: message/sipfrag
Content-Length: ...
SIP/2.0 200 OK
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bKadfe4ko
;received=192.0.2.123
From: Carol <sip:carol@chicago.example.com>;tag=ff3a
To: Alice <sip:alice@atlanta.example.com>;tag=3461
Call-ID: 9435674543@chicago.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
F25 200 OK Bob -> Carol
Johnston, et al. Expires August 2, 2003 [Page 56]
Internet-Draft SIP Service Examples February 2003
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
To: Bob <sip:bob@biloxi.example.com>;tag=1234567
From: Carol <sip:carol@chicago.example.com>;tag=5f35a3
Call-ID: 12345678900@atlanta.example.com
CSeq: 3 NOTIFY
Content-Length: 0
/* Bob disconnects with Alice */
F26 BYE Bob -> Alice
BYE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345678900@atlanta.example.com
CSeq: 1026 BYE
Content-Length: 0
F27 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345678900@atlanta.example.com
CSeq: 1026 BYE
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 57]
Internet-Draft SIP Service Examples February 2003
2.6 Call Forwarding Unconditional
Alice Proxy Gateway
| | |
| INVITE F1 | |
|--------------->| INVITE F2 |
|(100 Trying) F3 |------------->|
|<---------------|180 Ringing F4|
| 180 Ringing F5 |<-------------|
|<---------------| 200 OK F6 |
| 200 OK F7 |<-------------|
|<---------------| |
| ACK F8 | |
|--------------->| ACK F9 |
| |------------->|
| Both way RTP Established |
|<=============================>|
| BYE F10 | |
|--------------->| BYE F11 |
| |------------->|
| | 200 OK F12 |
| 200 OK F13 |<-------------|
|<---------------| |
| | |
Bob wants all calls forwarded to the PSTN. Alice calls Bob. The
Proxy server rewrites the request URI, and forwards the INVITE to a
Gateway. Details of messaging behind the Gateway are not shown.
Message Details
F1 INVITE Alice -> Proxy
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 58]
Internet-Draft SIP Service Examples February 2003
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
/* Proxy forwards call by rewriting Request-URI */
F2 INVITE Proxy -> Gateway
INVITE sip:+19727293660@gw1.example.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F3 (100 Trying) Proxy -> Alice
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F4 180 Ringing Gateway -> Proxy
Johnston, et al. Expires August 2, 2003 [Page 59]
Internet-Draft SIP Service Examples February 2003
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:+19727293660@gw1.example.com;user=phone>
Content Length:0
F5 180 Ringing Proxy -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:+19727293660@gw1.example.com;user=phone>
Content Length: 0
F6 200 OK Gateway -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:+19727293660@gw1.example.com;user=phone>
Content-Type: application/sdp
Content-Length: ...
v=0
o=GATEWAY1 2890844527 2890844527 IN IP4 gatewayone.example.com
s=Session SDP
Johnston, et al. Expires August 2, 2003 [Page 60]
Internet-Draft SIP Service Examples February 2003
c=IN IP4 gatewayone.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F7 200 OK Proxy -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:+19727293660@gw1.example.com;user=phone>
Content-Type: application/sdp
Content-Length: ...
v=0
o=GATEWAY1 2890844527 2890844527 IN IP4 gatewayone.example.com
s=Session SDP
c=IN IP4 gatewayone.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F8 ACK Alice -> Proxy
ACK sip:+19727293660@gw1.example.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F9 ACK Proxy -> Gateway
ACK sip:+19727293660@gw1.example.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Johnston, et al. Expires August 2, 2003 [Page 61]
Internet-Draft SIP Service Examples February 2003
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F10 BYE Alice -> Proxy 1
BYE sip:+19727293660@gw1.example.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:+19727293660@gw1.example.com;user=phone>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F11 BYE Proxy 1 -> Gateway
BYE sip:+19727293660@gw1.example.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F12 200 OK Gateway -> Proxy 1
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 62]
Internet-Draft SIP Service Examples February 2003
F13 200 OK Proxy 1 -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 63]
Internet-Draft SIP Service Examples February 2003
2.7 Call Forwarding - Busy
Alice Proxy User B1 User B2
| | | |
| INVITE F1 | | |
|--------------->| INVITE F2 | |
| |------------->| |
|(100 Trying) F3 | | |
|<---------------| 486 Busy F4 | |
| |<-------------| |
| | ACK F5 | |
| |------------->| |
| | | INVITE F6 |
| |--------------------------------->|
| | | 180 Ringing F7 |
| |<---------------------------------|
| 180 Ringing F8 | | |
|<---------------| | 200 OK F9 |
| |<---------------------------------|
| 200 OK F10 | | |
|<---------------| | |
| ACK F11 | | |
|--------------->| | ACK F12 |
| |--------------------------------->|
| Both way RTP Established |
|<=================================================>|
| BYE F13 | | |
|--------------->| | BYE F14 |
| |--------------------------------->|
| | | 200 OK F15 |
| 200 OK F16 |<---------------------------------|
|<---------------| | |
| | | |
Bob wants calls to B1 forwarded to B2 if B1 is busy (this information
is known to the proxy). Alice calls B1, B1 is busy, the proxy
server places call to B2.
Message Details
F1 INVITE Alice -> Proxy
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
Johnston, et al. Expires August 2, 2003 [Page 64]
Internet-Draft SIP Service Examples February 2003
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 INVITE Proxy -> Bob1
INVITE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F3 (100 Trying) Proxy -> Alice
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Johnston, et al. Expires August 2, 2003 [Page 65]
Internet-Draft SIP Service Examples February 2003
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F4 486 Busy Here B1 -> Proxy
SIP/2.0 486 Busy Here
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F5 ACK Proxy -> Bob1
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* The proxy now forwards the call to B2 */
F6 INVITE Proxy -> Bob2
INVITE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
Johnston, et al. Expires August 2, 2003 [Page 66]
Internet-Draft SIP Service Examples February 2003
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F7 180 Ringing B2 -> Proxy
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Content-Length: 0
F8 180 Ringing Proxy -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Content-Length: 0
F9 200 OK B2 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
Johnston, et al. Expires August 2, 2003 [Page 67]
Internet-Draft SIP Service Examples February 2003
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com
s=Session SDP
c=IN IP4 client2.biloxi.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F10 200 OK Proxy -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com
s=Session SDP
c=IN IP4 client2.biloxi.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F11 ACK Alice -> Proxy
ACK sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 68]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 ACK
Content-Length: 0
F12 ACK Proxy -> Bob2
ACK sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* RTP streams are established between A and B2 */
/* Alice eventually hangs up with User B2. */
F13 BYE Alice -> Proxy
BYE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F14 BYE Proxy -> Bob2
BYE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 69]
Internet-Draft SIP Service Examples February 2003
F15 200 OK B2 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F16 200 OK Proxy -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
2.8 Call Forwarding - No Answer
Alice Proxy User B1 User B2
| | | |
| INVITE F1 | | |
|--------------->| INVITE F2 | |
|(100 Trying) F3 |------------->| |
|<---------------|180 Ringing F4| |
| 180 Ringing F5 |<-------------| |
|<---------------| | |
| Request Timeout |
| | | |
| | CANCEL F6 | |
| |------------->| |
| | 200 OK F7 | |
| |<-------------| |
| | 487 F8 | |
| |<-------------| |
| | ACK F9 | |
| |------------->| |
Johnston, et al. Expires August 2, 2003 [Page 70]
Internet-Draft SIP Service Examples February 2003
| | | INVITE F10 |
| |--------------------------------->|
| | | 180 Ringing F11 |
| 180 Ringing F12|<---------------------------------|
|<---------------| | 200 OK F13 |
| |<---------------------------------|
| 200 OK F14 | | |
|<---------------| | |
| ACK F15 | | |
|--------------->| | ACK F16 |
| |--------------------------------->|
| Both way RTP Established |
|<=================================================>|
| BYE F17 | | |
|--------------->| | BYE F18 |
| |--------------------------------->|
| | | 200 OK F19 |
| 200 OK F20 |<---------------------------------|
|<---------------| | |
| | | |
Bob wants calls to B1 forwarded to B2 if B1 is not answered
(information is known to the proxy server). Alice calls B1 and no
one answers. The proxy server then places the call to B2.
Message Details
F1 INVITE Alice -> Proxy
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 71]
Internet-Draft SIP Service Examples February 2003
F2 INVITE Proxy -> Bob1
INVITE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F3 (100 Trying) Proxy -> Alice
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F4 180 Ringing B1 -> Proxy
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=3145678
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 72]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F5 180 Ringing Proxy -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=3145678
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
/* B1 rings until a configurable timer expires in the Proxy. The
Proxy sends Cancel and proceeds down the list of routes. */
F6 CANCEL Proxy -> Bob1
CANCEL sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 CANCEL
Content-Length: 0
F7 200 OK B1 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
From: Alice <sip:alice@atlanta.example.com>
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 CANCEL
Content-Length: 0
F8 487 Request Terminated B1 -> Proxy
Johnston, et al. Expires August 2, 2003 [Page 73]
Internet-Draft SIP Service Examples February 2003
SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=3145678
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F9 ACK Proxy -> Bob1
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=3145678
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F10 INVITE Proxy -> Bob2
INVITE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 74]
Internet-Draft SIP Service Examples February 2003
F11 180 Ringing B2 -> Proxy
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Content-Length: 0
F12 180 Proxy -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Content-Length: 0
F13 200 OK B2 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com
Johnston, et al. Expires August 2, 2003 [Page 75]
Internet-Draft SIP Service Examples February 2003
s=Session SDP
c=IN IP4 client2.biloxi.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F14 200 OK Proxy -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com
s=Session SDP
c=IN IP4 client2.biloxi.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F15 ACK Alice -> Proxy
ACK sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F16 ACK Proxy -> Bob2
ACK sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Johnston, et al. Expires August 2, 2003 [Page 76]
Internet-Draft SIP Service Examples February 2003
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* RTP streams are established between A and B2. Alice Hangs Up with User B2. */
F17 BYE Alice -> Proxy
BYE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F18 BYE Proxy -> Bob2
BYE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F19 200 OK B2 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 77]
Internet-Draft SIP Service Examples February 2003
CSeq: 2 BYE
Content-Length: 0
F20 200 OK Proxy -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 78]
Internet-Draft SIP Service Examples February 2003
2.9 3-way Conference Third Party is Added
Alice Bob Carol
| INVITE F1 | |
|--------------->| |
| 180 Ringing F2 | |
|<---------------| |
| 200 OK F3 | |
|<---------------| |
| ACK F4 | |
|--------------->| |
| RTP | |
|<==============>| |
| INVITE F5 | |
|<---------------| |
| 200 OK F6 | |
|--------------->| |
| ACK F7 | |
|<---------------| INVITE F8 |
| |------------->|
| | 180 F9 |
| |<-------------|
| | 200 OK F10 |
| |<-------------|
| | ACK F11 |
| |------------->|
| | RTP |
| |<============>|
In this scenario, Alice and Bob are in a 2-party call (session) when
Bob wishes to add Carol into the conversation. Bob is capable of
media mixing in a 3-party call. Bob first sends a re-INVITE to Alice
changing Contact URIs to one that indicates A's mixer. B then
INVITEs Carol using the same Contact URI.
Message Details
F1 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 79]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 180 Ringing Bob -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F3 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
Johnston, et al. Expires August 2, 2003 [Page 80]
Internet-Draft SIP Service Examples February 2003
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F4 ACK Alice -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Alice and Bob have established a session. Bob re-INVITEs changing Contact URIs */
F5 INVITE Bob -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1024 INVITE
Contact: <sip:bob-Mixer@client.biloxi.example.com>
Content-Type: application/sdp
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Length: ...
v=0
o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=sendonly
F6 200 OK Alice -> Bob
SIP/2.0 200 OK
Johnston, et al. Expires August 2, 2003 [Page 81]
Internet-Draft SIP Service Examples February 2003
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1024 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
F7 ACK Bob -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1024 ACK
Content-Length: 0
/* Bob calls Carol */
F8 INVITE Bob -> Carol
INVITE sip:carol@chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 42 INVITE
Contact: <sip:bob-Mixer@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Johnston, et al. Expires August 2, 2003 [Page 82]
Internet-Draft SIP Service Examples February 2003
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 28908445834 2890844834 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423645 0
m=audio 48174 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F9 180 Ringing Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=341313
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 42 INVITE
Contact: <sip:carol@client.chicago.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Length: 0
F10 200 OK Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=341313
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 42 INVITE
Contact: <sip:carol@client.chicago.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
Johnston, et al. Expires August 2, 2003 [Page 83]
Internet-Draft SIP Service Examples February 2003
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F11 ACK Bob -> Carol
ACK sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=341313
Call-ID: sdjfdjfskdf@biloxi.example.com
CSeq: 42 ACK
Content-Length: 0
/* User B's mixer know mixes media from both A and C to create the 3-way conference. */
Johnston, et al. Expires August 2, 2003 [Page 84]
Internet-Draft SIP Service Examples February 2003
2.10 3-way Conference Third Party Joins
Alice Bob Carol
| INVITE F1 | |
|--------------->| |
| 180 Ringing F2 | |
|<---------------| |
| 200 OK F3 | |
|<---------------| |
| ACK F4 | |
|--------------->| |
| RTP | |
|<==============>| INVITE Join:A-B F5
| |<-------------|
| | 180 F6 |
| |------------->|
| INVITE F7 | |
|<---------------| |
| 200 OK F8 | |
|--------------->| |
| ACK F9 | |
|<---------------| |
| | 200 OK F10 |
| |------------->|
| | ACK F11 |
| |<-------------|
| | RTP |
| |<============>|
In this scenario, Alice and Bob are in a 2 party call and Carol
wishes to join resulting in a three party call. Carol could have
learned Bobs conference URI using some non-SIP means, or possibly
from a NOTIFY with the dialog package sent by Bob. Carol sends an
INVITE to Bob containing a Join header identifying the dialog between
Alice and Bob. Bob re-INVITEs Alice to switch to Bob's mixer then
accepts the INVITE from Carol, resulting in the 3-way call.
Message Details
F1 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Johnston, et al. Expires August 2, 2003 [Page 85]
Internet-Draft SIP Service Examples February 2003
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 180 Ringing Bob -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F3 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces, join
Content-Type: application/sdp
Content-Length: ...
Johnston, et al. Expires August 2, 2003 [Page 86]
Internet-Draft SIP Service Examples February 2003
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F4 ACK Alice -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Alice and Bob have established a session. Carol requests to join the session */
F5 INVITE Carol -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Carol <sip:carol@chicago.example.com>;tag=8675309
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 452k499sk@chicago.example.com
CSeq: 99 INVITE
Contact: <sip:carol@client.chicago.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces, join
Join: 12345600@atlanta.example.com;from-tag=1234567;to-tag=23431
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 87]
Internet-Draft SIP Service Examples February 2003
F6 180 Ringing Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bKnashds7
;received=120.
From: Carol <sip:carol@chicago.example.com>;tag=8675309
To: Bob <sip:bob@biloxi.example.com>;tag=0982
Call-ID: 452k499sk@chicago.example.com
CSeq: 99 INVITE
Contact: <sip:bob-Mixer@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Length: 0
F7 INVITE Bob -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1024 INVITE
Contact: <sip:bob-Mixer@client.biloxi.example.com>
Content-Type: application/sdp
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Length: ...
v=0
o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F8 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 88]
Internet-Draft SIP Service Examples February 2003
CSeq: 1024 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F9 ACK Bob -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=23431
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1024 ACK
Content-Length: 0
F10 200 OK Bob -> Carol
SIP/2.0 200 OK
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bKnashds7
;received=120.
From: Carol <sip:carol@chicago.example.com>;tag=8675309
To: Bob <sip:bob@biloxi.example.com>;tag=0982
Call-ID: 452k499sk@chicago.example.com
CSeq: 99 INVITE
Contact: <sip:bob-Mixer@client.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 28908445834 2890844834 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423645 0
m=audio 48174 RTP/AVP 0
Johnston, et al. Expires August 2, 2003 [Page 89]
Internet-Draft SIP Service Examples February 2003
a=rtpmap:0 PCMU/8000
F11 ACK OK Bob -> Carol
ACK sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Carol <sip:carol@chicago.example.com>;tag=8675309
To: Bob <sip:bob@biloxi.example.com>;tag=0982
Call-ID: 452k499sk@chicago.example.com
CSeq: 99 ACK
Content-Length:0
2.11 Single Line Extension
Alice Forking Proxy User User User
B1 B2 B3
| | | | |
| INVITE F1 | | | |
|--------------->| INVITE F2 | | |
| |------------->| | |
| | INVITE F3 | |
| |-------------------->| |
| | INVITE F4 | |
| |--------------------------->|
| 100 Trying F5 | | | |
|<---------------|180 Ringing F6| | |
| |<-------------| | |
| 180 Ringing F7 | | | |
|<---------------| | | |
| | 480 Not Logged In F8| |
| |<--------------------| |
| | ACK F9 | |
| |-------------------->| |
| | 180 Ringing F10 |
| 180 F11 |<---------------------------|
|<---------------| 200 OK F12 |
| 200 OK F13 |<---------------------------|
|<---------------| | | |
| | CANCEL 14 | | |
| |------------->| | |
| | 200 OK F15 | | |
| |<-------------| | |
| | 487 F16 | | |
Johnston, et al. Expires August 2, 2003 [Page 90]
Internet-Draft SIP Service Examples February 2003
| |<-------------| | |
| | ACK F17 | | |
| |------------->| | |
| ACK F18 | | | |
|--------------->| ACK F19 | |
| |--------------------------->|
| Both way RTP Established |
|<===========================================>|
| | NOTIFY F20 |
| |<---------------------------|
| | NOTIFY F21 | | |
| |------------->| | |
| | NOTIFY F22 | |
| |-------------------->| |
| | NOTIFY F23 | |
| |--------------------------->|
| | 200 OK F24 | | |
| |<-------------| | |
| | 200 OK F25 |
| |--------------------------->|
| | 200 OK F26 | |
| |<--------------------| |
| | 482 Loop Detected F27 |
| |<---------------------------|
| | |
| User B2 wants to join the call |
| | |
| | INVITE Join:A-B3 F28 |
| |<--------------------| |
| | INVITE Join: A-B3 F29 |
| |------------->| | |
| | INVITE Join: A-B3 F30 |
| |-------------------->| |
| | INVITE Join: A-B3 F31
| |--------------------------->|
| | 100 Trying F32 | |
| |-------------------->| |
| | 481 Dialog Does Not Exist F33
| |<-------------| | |
| | ACK F34 | | |
| |------------->| | |
| | 482 Loop Detected F35 |
| |<--------------------| |
| | ACK F36 | |
| |-------------------->| |
| | 200 OK F37 |
| |<---------------------------|
Johnston, et al. Expires August 2, 2003 [Page 91]
Internet-Draft SIP Service Examples February 2003
| | 200 OK F38 | |
| |-------------------->| |
| | |ACK F39
| | |----->|
| | Both way RTP Established
| | |<====>| B3 mixes RTP
| | | |
In Single Line Extension a call will ring several extensions at the
same time (forking). The extension to answer the call becomes the
active set. If other extensions pick up, the call becomes a
conference call.
In this flow, Alice calls Bob which results in the INVITE being
forked to three devices, B1, B2, and B3. B3 answers the call and is
connected to A. B3 sends a NOTIFY containing the dialog information
to B, which is forked to B1 and B2. B2 wishes to join the call and
sends an INVITE with a Join header field to B to request this. This
INVITE is forked and is accepted by B3 who then performs the mixing
function.
Note that if B3 is not capable of mixing the media, B3 would transfer
both Alice and B2 to a conferencing bridge which would perform the
mixing.
The use of SUBSCRIBE and NOTIFY is defined in [11] while the dialog
Event package is defined in [10].
Message Details
F1 INVITE Alice -> Proxy
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 92]
Internet-Draft SIP Service Examples February 2003
t= 0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 INVITE Proxy -> Bob1
INVITE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t= 0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F3 INVITE Proxy -> Bob2
INVITE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 93]
Internet-Draft SIP Service Examples February 2003
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F4 INVITE Proxy -> Bob3
INVITE sip:bob@client3.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.3
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F5 100 Trying Proxy -> Alice
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F6 180 Ringing B1 -> Proxy
SIP/2.0 180 Ringing
Johnston, et al. Expires August 2, 2003 [Page 94]
Internet-Draft SIP Service Examples February 2003
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F7 180 Ringing Proxy -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F8 480 Not Logged In B2 -> Proxy
SIP/2.0 480 Not Logged In
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314756
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F9 ACK Proxy -> Bob2
ACK sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314756
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Johnston, et al. Expires August 2, 2003 [Page 95]
Internet-Draft SIP Service Examples February 2003
Content-Length: 0
F10 180 Ringing B3 -> Proxy
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=83749.3
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client3.biloxi.example.com>
Content-Length: 0
F11 180 Ringing B3 -> Proxy
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client3.biloxi.example.com>
Content-Length: 0
F12 200 OK B3 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=83749.3
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client3.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client3.biloxi.example.com
Johnston, et al. Expires August 2, 2003 [Page 96]
Internet-Draft SIP Service Examples February 2003
s=Session SDP
c=IN IP4 client3.biloxi.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F13 200 OK Proxy -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com.115>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client3.biloxi.example.com
s=Session SDP
c=IN IP4 client3.biloxi.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
/* Forking Proxy cancels pending branch B1 */
F14 CANCEL Proxy -> Bob1
CANCEL sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 CANCEL
Content-Length: 0
F15 200 OK B1 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Johnston, et al. Expires August 2, 2003 [Page 97]
Internet-Draft SIP Service Examples February 2003
From: Alice <sip:alice@atlanta.example.com>
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 CANCEL
Content-Length: 0
F16 487 Request Terminated B1 -> Proxy
SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F17 ACK Proxy -> Bob1
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F18 ACK Alice -> Proxy
ACK sip:bob@client3.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F19 ACK Proxy -> Bob3
ACK sip:bob@client3.biloxi.example.com SIP/2.0
Johnston, et al. Expires August 2, 2003 [Page 98]
Internet-Draft SIP Service Examples February 2003
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.3
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* RTP streams are established between A and B3*/
/* User B3 sends a NOTIFY to the group with established dialog information. */
F20 NOTIFY B3 -> Proxy
NOTIFY sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=w2Hu8sj
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 8458999275@biloxi.example.com
CSeq: 1 NOTIFY
Event: dialog
Subscription-State: active;expires=3600
Content-Type: application/dialog-info+xml
Content-Length: ...
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="0" state="partial" entity="sip:bob@biloxi.example.com">
<dialog id="2393lds3204" call-id="12345600@atlanta.example.com"
local-tag="7137136" remote-tag="1234567" direction="recipient">
<state event="2xx">confirmed</state>
</dialog>
</dialog-info>
F21 NOTIFY Proxy -> Bob1
NOTIFY sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.115
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=w2Hu8sj
To: Bob <sip:bob@biloxi.example.com>
Johnston, et al. Expires August 2, 2003 [Page 99]
Internet-Draft SIP Service Examples February 2003
Call-ID: 8458999275@biloxi.example.com
CSeq: 1 NOTIFY
Event: dialog
Subscription-State: active;expires=3600
Content-Type: application/dialog-info+xml
Content-Length: ...
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="0" state="partial" entity="sip:bob@biloxi.example.com">
<dialog id="2393lds3204" call-id="12345600@atlanta.example.com"
local-tag="7137136" remote-tag="1234567" direction="recipient">
<state event="2xx">confirmed</state>
</dialog>
</dialog-info>
F22 Proxy -> Bob2
NOTIFY sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.2
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.115
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=w2Hu8sj
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 8458999275@biloxi.example.com
CSeq: 1 NOTIFY
Event: dialog
Subscription-State: active;expires=3600
Content-Type: application/dialog-info+xml
Content-Length: ...
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="0" state="partial" entity="sip:bob@biloxi.example.com">
<dialog id="2393lds3204" call-id="12345600@atlanta.example.com"
local-tag="7137136" remote-tag="1234567" direction="recipient">
<state event="2xx">confirmed</state>
</dialog>
</dialog-info>
F23 NOTIFY Proxy-> Bob3
NOTIFY sip:bob@client3.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.3
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
Johnston, et al. Expires August 2, 2003 [Page 100]
Internet-Draft SIP Service Examples February 2003
;received=192.0.2.115
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=w2Hu8sj
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 8458999275@biloxi.example.com
CSeq: 1 NOTIFY
Event: dialog
Subscription-State: active;expires=3600
Content-Type: application/dialog-info+xml
Content-Length: ...
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="0" state="partial" entity="sip:bob@biloxi.example.com">
<dialog id="2393lds3204" call-id="12345600@atlanta.example.com"
local-tag="7137136" remote-tag="1234567" direction="recipient">
<state event="2xx">confirmed</state>
</dialog>
</dialog-info>
F24 200 OK B1 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.115
From: Bob <sip:bob@biloxi.example.com>;tag=w2Hu8sj
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 8458999275@biloxi.example.com
CSeq: 1 NOTIFY
Content-Length: 0
F25 200 OK Proxy -> Bob3
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.115
From: Bob <sip:bob@biloxi.example.com>;tag=w2Hu8sj
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 8458999275@biloxi.example.com
CSeq: 1 NOTIFY
Content-Length: 0
F26 200 OK B2 -> Proxy
Johnston, et al. Expires August 2, 2003 [Page 101]
Internet-Draft SIP Service Examples February 2003
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.2
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.115
From: Bob <sip:bob@biloxi.example.com>;tag=w2Hu8sj
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 8458999275@biloxi.example.com
CSeq: 1 NOTIFY
Content-Length: 0
F27 200 OK B3 -> Proxy
SIP/2.0 482 Loop Detected
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.3
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.115
From: Bob <sip:bob@biloxi.example.com>;tag=w2Hu8sj
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 8458999275@biloxi.example.com
CSeq: 1 NOTIFY
Content-Length: 0
/* User B2 decided to join the call. */
F28 INVITE B2 -> Proxy
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Join: 12345600@atlanta.example.com;to-tag=765432;from-tag=1234567
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com
s=Session SDP
c=IN IP4 client2.biloxi.example.com
t=0 0
Johnston, et al. Expires August 2, 2003 [Page 102]
Internet-Draft SIP Service Examples February 2003
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F29 INVITE Proxy -> Bob1
INVITE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.114
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Join: 12345600@atlanta.example.com;to-tag=765432;from-tag=1234567
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com
s=Session SDP
c=IN IP4 client2.biloxi.example.com
t=0 0
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F30 INVITE Proxy -> Bob2
INVITE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.2
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.114
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Join: 12345600@atlanta.example.com;to-tag=765432;from-tag=1234567
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com
s=Session SDP
Johnston, et al. Expires August 2, 2003 [Page 103]
Internet-Draft SIP Service Examples February 2003
c=IN IP4 client2.biloxi.example.com
t=0 0
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F31 INVITE Proxy -> Bob1
INVITE sip:bob@client3.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.3
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.114
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client2.biloxi.example.com>
Join: 12345600@atlanta.example.com;to-tag=765432;from-tag=1234567
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com
s=Session SDP
c=IN IP4 client2.biloxi.example.com
t=0 0
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F32 100 Trying Proxy -> Bob2
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.114
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Content-Length: 0
/* B1 does not have an established dialog, so it returns a 481 */
F33 481 Dialog Does Not Exist B1 -> Proxy
Johnston, et al. Expires August 2, 2003 [Page 104]
Internet-Draft SIP Service Examples February 2003
SIP/2.0 481 Dialog Does Not Exist
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.3
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.114
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>;tag=68324lk42jd
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Content-Length: 0
F34 ACK Proxy -> Bob1
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.3
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>;tag=68324lk42jd
Call-ID: 524251233@biloxi.example.com
CSeq: 1 ACK
Content-Length: 0
F35 482 Loop Detected B2 -> Proxy
SIP/2.0 482 Loop Detected
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.2
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.114
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>;tag=134lkwe
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Content-Length: 0
F36 ACK Proxy -> Bob2
ACK sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.2
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>;tag=134lkwe
Call-ID: 524251233@biloxi.example.com
CSeq: 1 ACK
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 105]
Internet-Draft SIP Service Examples February 2003
/* B3 has an existing dialog and agrees to mix B2 into the session. */
F37 200 OK User B3 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK4558a.3
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.114
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>;tag=3891908734
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client3.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client3.biloxi.example.com
s=Session SDP
c=IN IP4 client3.biloxi.example.com
t=0 0
m=audio 3460 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F38 200 OK User B3 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
;received=192.0.2.114
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>;tag=3891908734
Call-ID: 524251233@biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client3.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client3.biloxi.example.com
s=Session SDP
c=IN IP4 client3.biloxi.example.com
t=0 0
m=audio 3460 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 106]
Internet-Draft SIP Service Examples February 2003
F39 ACK B2 -> Bob3
ACK sip:bob@client3.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKq0qwli6ewlk
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=4524524312
To: Bob <sip:bob@biloxi.example.com>;tag=3891908734
Call-ID: 524251233@biloxi.example.com
CSeq: 1 ACK
Content-Length: 0
2.12 Find-Me
Alice Proxy User User User User
B1 B2 B3 B4
| | | | | |
| INVITE F1 | | | | |
|--------------->| INVITE F2 | | | |
| |------------->| | | |
|(100 Trying) F3 | | | | |
|<---------------|180 Ringing F4| | | |
| |<-------------| | | |
| 180 Ringing F5 | | | | |
|<---------------| | | | |
| | Timeout | | | |
| | | | | |
| | CANCEL F6 | | | |
| |------------->| | | |
| | 200 OK F7 | | | |
| |<-------------| | | |
| | 487 F8 | | | |
| |<-------------| | | |
| | ACK F9 | | | |
| |------------->| | | |
| | INVITE F10 | | |
| |-------------------->| | |
| |480 Not Logged In F11| | |
| |<--------------------| | |
| | ACK F12| | |
| |-------------------->| | |
| | INVITE F13 | |
| |--------------------------->| |
| | 486 Busy Here F14 | |
| |<---------------------------| |
| | ACK F15 | |
| |--------------------------->| |
Johnston, et al. Expires August 2, 2003 [Page 107]
Internet-Draft SIP Service Examples February 2003
| | INVITE F16 |
| |---------------------------------->|
| | 180 Ringing F17 |
| 180 F18 |<----------------------------------|
|<---------------| 200 OK F19 |
| 200 OK F20 |<----------------------------------|
|<---------------| |
| ACK F21 | |
|--------------->| ACK F22 |
| |---------------------------------->|
| Both way RTP Established |
|<==================================================>|
| | BYE F23 |
| BYE F24 |<----------------------------------|
|<---------------| |
| 200 OK F25 | |
|--------------->| 200 OK F26 |
| |---------------------------------->|
| | |
Alice's call to Bob will result in an attempt to locate that user by
calling locations from a list of contacts. The location to answer
the call becomes the active set, no other sets may join the call.
While this flow shows a sequential search, the search could be
accomplished using parallel forking, as in the previous example.
Message Details
F1 INVITE Alice -> Proxy
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 108]
Internet-Draft SIP Service Examples February 2003
t= 0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 INVITE Proxy -> Bob1
INVITE sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t= 0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F3 (100 Trying) Proxy -> Alice
SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F4 180 Ringing B1 -> Proxy
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Johnston, et al. Expires August 2, 2003 [Page 109]
Internet-Draft SIP Service Examples February 2003
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F5 180 Ringing Proxy -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
/* B1 rings for until a configurable timer in the Proxy expires. The
Proxy then sends Cancel and proceeds down the list of routes. */
F6 CANCEL Proxy -> Bob1
CANCEL sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 CANCEL
Content-Length: 0
F7 200 OK B1 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
From: Alice <sip:alice@atlanta.example.com>
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 CANCEL
Johnston, et al. Expires August 2, 2003 [Page 110]
Internet-Draft SIP Service Examples February 2003
Content-Length: 0
F8 487 Request Terminated B1 -> Proxy
SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F9 ACK Proxy -> Bob1
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=765432
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F10 INVITE Proxy -> Bob2
INVITE sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
Johnston, et al. Expires August 2, 2003 [Page 111]
Internet-Draft SIP Service Examples February 2003
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F11 480 Not Logged In B2 -> Proxy
SIP/2.0 480 Not Logged In
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
;received=192.0.2.54
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314756
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F12 ACK Proxy -> Bob2
ACK sip:bob@client2.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.2
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314756
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F13 INVITE Proxy -> Bob3
INVITE sip:bob@client3.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.3
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
Johnston, et al. Expires August 2, 2003 [Page 112]
Internet-Draft SIP Service Examples February 2003
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F14 486 Busy Here B3 -> Proxy
SIP/2.0 486 Busy Here
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.3
;received=192.0.2.54
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F15 ACK Proxy -> Bob3
ACK sip:bob@client3.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.3
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7654321
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F16 INVITE Proxy -> Bob4
INVITE sip:bob@client4.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=83749.4
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
Johnston, et al. Expires August 2, 2003 [Page 113]
Internet-Draft SIP Service Examples February 2003
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F17 180 Ringing B4 -> Proxy
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.example.com:5060;branch=83749.4
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client4.biloxi.example.com>
Content-Length: 0
F18 180 Ringing B4 -> Proxy
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client4.biloxi.example.com>
Content-Length: 0
F19 200 OK B4 -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=83749.4
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 114]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 INVITE
Contact: <sip:bob@client4.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client4.biloxi.example.com
s=Session SDP
c=IN IP4 client4.biloxi.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F20 200 OK Proxy -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sip:ss1.example.com;lr>
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com.116>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client4.biloxi.example.com
s=Session SDP
c=IN IP4 client4.biloxi.example.com
t=0 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F21 ACK Alice -> Proxy
ACK sip:bob@client4.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Johnston, et al. Expires August 2, 2003 [Page 115]
Internet-Draft SIP Service Examples February 2003
Content-Length: 0
F22 ACK Proxy -> Bob4
ACK sip:bob@client4.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
Max-Forwards: 69
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7137136
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* RTP streams are established between A and B4*/
/* User B4 Hangs Up with User A. */
F23 BYE B4 -> Proxy
BYE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Route: <sip:ss1.example.com;lr>
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=7137136
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 BYE
Content-Length: 0
F24 BYE Proxy -> Alice
BYE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
Max-Forwards: 69
From: Bob <sip:bob@biloxi.example.com>;tag=7137136
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 BYE
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 116]
Internet-Draft SIP Service Examples February 2003
F25 200 OK Alice -> Proxy
SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
;received=192.0.2.54
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Bob <sip:bob@biloxi.example.com>;tag=7137136
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 BYE
Content-Length: 0
F26 200 OK Proxy -> Bob4
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Bob <sip:bob@biloxi.example.com>;tag=7137136
To: Alice <sip:alice@atlanta.example.com>;tag=1234567
Call-ID: 12345600@atlanta.example.com
CSeq: 1 BYE
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 117]
Internet-Draft SIP Service Examples February 2003
2.13 Call Management (Incoming Call Screening)
Alice Proxy Bob
| | |
| INVITE F1 | |
|------------------------------>|
| 305 Use Proxy F2 |
|<------------------------------|
| ACK F3 | |
|------------------------------>|
| INVITE F4 | |
|--------------->| |
| 407 Proxy Authorization F5 |
|<---------------| |
| ACK F6 | |
|--------------->| |
| INVITE F7 | |
|--------------->| |
| 403 Screening Failure (Terminating) F8
|<---------------| |
| ACK F9 | |
|--------------->| |
| | |
Bob has an incoming call screening list, Alice is included on the
list of addresses Bob will not accept calls from. Alice attempts
to call user B. Messages F1, F2, and F3 are included to show that
Bob does not accept INVITEs that have not been screened by the
proxy.
Note that call screening can not be done using the From header
instead some form of authentication credentials must be used.
Message Details
F1 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Johnston, et al. Expires August 2, 2003 [Page 118]
Internet-Draft SIP Service Examples February 2003
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
/* Bob only accepts INVITEs that have been screened by the proxy */
F2 305 Use Proxy Bob -> Alice
SIP/2.0 305 Use Proxy
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=342123
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:ss1.example.com>
Content-Length: 0
F3 ACK Alice -> Bob
ACK sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=342123
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* A retries the call through the proxy */
F4 INVITE Alice -> Proxy 1
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
Johnston, et al. Expires August 2, 2003 [Page 119]
Internet-Draft SIP Service Examples February 2003
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
/* Proxy 1 challenges Alice for authentication */
F5 407 Proxy Authorization Required Proxy 1 -> Alice
SIP/2.0 407 Proxy Authorization Required
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7886765
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Proxy-Authenticate: Digest realm="example.com",
domain="sip:ss1.example.com", nonce="ea9c8e88df84f1cec4341ae6cbe5a359",
opaque="", stale=FALSE, algorithm=MD5
Content-Length: 0
F6 ACK Alice -> Proxy 1
ACK sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=7886765
Call-ID: 12345600@atlanta.example.com
CSeq: 2 ACK
Content-Length: 0
/* Alice responds by sending an INVITE with authentication
credentials in it. */
Johnston, et al. Expires August 2, 2003 [Page 120]
Internet-Draft SIP Service Examples February 2003
F7 INVITE Alice -> Proxy 1
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 3 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Proxy-Authorization: Digest username="alice",
realm="example.com", nonce="ae9137be1c87d175c2dd63302a0d6e0a",
opaque="", uri="sip:bob@biloxi.example.com",
response="bbaec39f943bdcb3620d90afc548a45c"
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F8 403 Screening Failure (Terminating) Proxy 1 -> Alice
SIP/2.0 403 Screening Failure (Terminating)
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=ffe254
Call-ID: 12345600@atlanta.example.com
CSeq: 3 INVITE
Error-Info: <sip:screen-failure-term-ann@annoucement.company.com>
Content-Length: 0
F9 ACK Alice -> Proxy 1
ACK sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=ffe254
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 121]
Internet-Draft SIP Service Examples February 2003
Proxy-Authorization: Digest username="alice",
realm="example.com", nonce="ae9137be1c87d175c2dd63302a0d6e0a",
opaque="", uri="sip:bob@biloxi.example.com",
response="bbaec39f943bdcb3620d90afc548a45c"
CSeq: 3 ACK
Content-Length: 0
2.14 Call Management (Outgoing Call Screening)
Alice Proxy Bob
| | |
| INVITE F1 | |
|--------------->| |
| 407 Proxy Authorization F2 |
|<---------------| |
| ACK F3 | |
|--------------->| |
| INVITE F4 | |
|--------------->| |
| 403 Screening Failure (Originating) F5
|<---------------| |
| ACK F6 | |
|--------------->| |
| | |
Alice has an outgoing call screening list, Bob is included on the
list of addresses Alice will not be able to place a call to. Alice
attempts to call Bob.
Message Details
F1 INVITE Alice -> Proxy 1
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
Johnston, et al. Expires August 2, 2003 [Page 122]
Internet-Draft SIP Service Examples February 2003
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
/* Proxy 1 challenges Alice for authentication */
F2 407 Proxy Authorization Required Proxy 1 -> Alice
SIP/2.0 407 Proxy Authorization Required
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=90210
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Proxy-Authenticate: Digest realm="example.com",
domain="sip:ss1.example.com", nonce="ea9c8e88df84f1cec4341ae6cbe5a359",
opaque="", stale=FALSE, algorithm=MD5
Content-Length: 0
F3 ACK Alice -> Proxy 1
ACK sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=90210
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Alice responds be sending an INVITE with authentication
credentials in it. */
F4 INVITE Alice -> Proxy 1
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Johnston, et al. Expires August 2, 2003 [Page 123]
Internet-Draft SIP Service Examples February 2003
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Proxy-Authorization: Digest username="alice", realm="example.com",
nonce="cb360afc54bbaec39f943bd820d9a45c", opaque="",
uri="sip:bob@biloxi.example.com",
response="b9d2e5bcdec9f69ab2a9b44f270285a6"
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F5 403 Screening Failure (Originating) Proxy 1 -> Alice
SIP/2.0 403 Screening Failure (Originating)
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=18017
Call-ID: 12345600@atlanta.example.com
CSeq: 2 INVITE
Error-Info: <sip:screen-failure-orig-ann@annoucement.company.com>
Content-Length: 0
F6 ACK Alice -> Proxy 1
ACK sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=18017
Call-ID: 12345600@atlanta.example.com
CSeq: 2 ACK
Proxy-Authorization: Digest username="alice", realm="example.com",
nonce="cb360afc54bbaec39f943bd820d9a45c", opaque="",
uri="sip:bob@biloxi.example.com",
response="b9d2e5bcdec9f69ab2a9b44f270285a6"
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 124]
Internet-Draft SIP Service Examples February 2003
2.15 Call Park
Alice Bob Park Server Carol
| | | |
| INVITE F1 | | |
|------------->| | |
|180 Ringing F2| | |
|<-------------| | |
| 200 OK F3 | | |
|<-------------| | |
| ACK F4 | | |
|------------->| | |
| RTP Media | | |
|<============>| | |
| Bob Parks Call | |
| | REFER Refer-To: A F5 |
| |------------->| |
| | 202 F6 | |
| |<-------------| |
| | NOTIFY F7 | |
| |<-------------| |
| | 200 F8 | |
| |------------->| |
| INVITE F9 Replaces: B | |
|<----------------------------| |
| 200 OK F10 | |
|---------------------------->| |
| ACK F11 | |
|<----------------------------| |
| RTP Music | |
|<===========================>| |
| BYE F12 | | |
|------------->| NOTIFY F14 | |
| 200 OK F13 |<-------------| |
|<-------------| 200 OK F15 | |
| |------------->| |
| | Carol picks up the call |
| | | |
| INVITE Replaces: Park Server F16 |
|<-------------------------------------------|
| | | 200 F17 |
|------------------------------------------->|
| | | ACK F18 |
|<-------------------------------------------|
| RTP Media |
|<==========================================>|
| BYE F19 | |
Johnston, et al. Expires August 2, 2003 [Page 125]
Internet-Draft SIP Service Examples February 2003
|---------------------------->| |
| 200 OK F20 | |
|<----------------------------| |
| No more RTP Music | |
In this example, Alice calls Bob. Bob then parks the call at the
Park Server by sending a REFER to the Park Server. The server sends
an INVITE to Alice which replaces the session between Alice and Bob.
The call is accepted by Alice and causes Alice to send a BYE to Bob.
Bob receives notification of the successful park, and also receives
the Call-ID in the application/sip body of the NOTIFY response.
Carol wishes to retrieve the call, a new INVITE is sent to Alice
which replaces the session with the Park Server. Alice accepts the
call and sends a BYE to the Park Server. Note that if the Park Server
did not return the dialog identifiers (Call-ID, To and From tags) in
the NOTIFY, Carol could send a SUBSCRIBE to retrieve this
information.
Note that this call is a special case of call transfer.
Note also that this flow could also be used for Music on Hold.
Message Details.
F1 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Johnston, et al. Expires August 2, 2003 [Page 126]
Internet-Draft SIP Service Examples February 2003
F2 180 Ringing Bob -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F3 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F4 ACK Alice -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Bob REFERs Park Server to establish session with A which replaces the established session between A and B. Note that there is no session established between B and the Park Server. */
Johnston, et al. Expires August 2, 2003 [Page 127]
Internet-Draft SIP Service Examples February 2003
F5 REFER Bob -> Park Server
REFER sip:park@server.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=02134
To: Park Server <sip:park@server.example.com>
Call-ID: 4802029847@biloxi.example.com
CSeq: 1 REFER
Refer-To: <sip:alice@client.atlanta.example.com?Replaces=
12345601@atlanta.example.com%3Bfrom-tag%3D314159%3Bto-tag%3D1234567>
Referred-By: <sip:bob@biloxi.example.com>
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F6 202 Accepted Park Server -> Bob
SIP/2.0 202 Accepted
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Bob <sip:bob@biloxi.example.com>;tag=02134
To: Park Server <sip:park@server.example.com>;tag=56323
Call-ID: 4802029847@biloxi.example.com
CSeq: 1 REFER
Content-Length: 0
F7 NOTIFY Park Server -> Bob
NOTIFY sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
To: Bob <sip:bob@biloxi.example.com>;tag=02134
Max-Forwards: 70
From: Park Server <sip:park@server.example.com>;tag=56323
Call-ID: 4802029847@biloxi.example.com
CSeq: 1 NOTIFY
Event: refer
Subscription-State: active;expires=60
Content-Type: message/sipfrag
Content-Length: ...
SIP/2.0 100 Trying
F8 200 OK Bob -> Park Server
SIP/2.0 200 OK
Johnston, et al. Expires August 2, 2003 [Page 128]
Internet-Draft SIP Service Examples February 2003
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
To: Bob <sip:bob@biloxi.example.com>;tag=02134
From: Park Server <sip:park@server.example.com>;tag=56323
Call-ID: 4802029847@biloxi.example.com
CSeq: 1 NOTIFY
Content-Length: 0
/* Park Server places call to Alice to replace session between Alice and Bob */
F9 INVITE Park Server -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP server.example.com:5060
Max-Forwards: 70
From: <sip:park@server.example.com>;tag=0111
To: <sip:alice@client.atlanta.example.com>
Call-ID: a5-75-34-12-76@server.example.com
CSeq: 1 INVITE
Referred-By: <sip:bob@biloxi.example.com>
Contact: <sip:park@server.example.com>
Replaces: 12345601@atlanta.example.com;from-tag=314159;to-tag=1234567
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Content-Type: application/sdp
Content-Length: ...
v=0
o=ParkServer 2890844576 2890844576 IN IP4 Park.server.example.com
s=Session SDP
c=IN IP4 music.server.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F10 200 OK Alice -> Park Server
SIP/2.0 200 OK
Via: SIP/2.0/UDP music.server.example.com:5060
From: <sip:park@server.example.com>;tag=0111
To: Alice <sip:alice@client.atlanta.example.com>;tag=098594
Call-ID: a5-75-34-12-76@server.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Supported: replaces
Content-Type: application/sdp
Johnston, et al. Expires August 2, 2003 [Page 129]
Internet-Draft SIP Service Examples February 2003
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=recvonly
F11 ACK Park Server -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP music.server.example.com:5060
Max-Forwards: 70
From: <sip:park@server.example.com>;tag=0111
To: Alice <sip:alice@client.atlanta.example.com>;tag=098594
Call-ID: a5-75-34-12-76@server.example.com
CSeq: 1 ACK
Content-Length: 0
F12 BYE Alice -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
F13 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.105
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 2 BYE
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 130]
Internet-Draft SIP Service Examples February 2003
/* Park Server reports success back to B by returning all the SIP headers in 200 OK response */
F14 NOTIFY Park Server -> Bob
NOTIFY sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
To: Bob <sip:bob@biloxi.example.com>;tag=02134
Max-Forwards: 70
From: Park Server <sip:park@server.example.com>;tag=56323
Call-ID: 4802029847@biloxi.example.com
CSeq: 1 NOTIFY
Event: refer
Subscription-State: terminated;reason=noresource
Content-Type: message/sipfrag
Content-Length: ...
SIP/2.0 200 OK
Via: SIP/2.0/UDP music.server.example.com:5060
From: <sip:park@server.example.com>;tag=0111
To: Alice <sip:alice@client.atlanta.example.com>;tag=098594
Call-ID: a5-75-34-12-76@server.example.com
CSeq: 2 INVITE
Contact: <sip:alice@client.atlanta.example.com>
F15 200 OK Bob -> Park Server
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
To: Bob <sip:bob@biloxi.example.com>;tag=02134
From: Park Server <sip:park@server.example.com>;tag=56323
Call-ID: 4802029847@biloxi.example.com
CSeq: 2 NOTIFY
Content-Length: 0
/* Alice is now parked at the Park Server */
/* Carol picks up the call by sending an INVITE to A which replaces the existing session with the Park/Park Server. Carol needs to know the
dialog information to construct the Replaces header. */
F16 INVITE Carol -> Alice
INVITE sip:alice@atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP chicago.example.com:5060;branch=z9hG4bK74bf9
Johnston, et al. Expires August 2, 2003 [Page 131]
Internet-Draft SIP Service Examples February 2003
Max-Forwards: 70
From: Carol <sip:carol@chicago.example.com>;tag=5893461
To: Alice <sip:alice@atlanta.example.com>
Call-ID: 6485356@chicago.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Replaces: a5-75-34-12-76@server.example.com;from-tag=098594;to-tag=0111
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F17 200 OK Alice -> Carol
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.105
From: Carol <sip:carol@chicago.example.com>;tag=5893461
To: Alice <sip:alice@atlanta.example.com>;tag=222
Call-ID: 6485356@chicago.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844527 2890844527 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F18 ACK Carol -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
Johnston, et al. Expires August 2, 2003 [Page 132]
Internet-Draft SIP Service Examples February 2003
From: Carol <sip:carol@chicago.example.com>;tag=5893461
To: Alice <sip:alice@atlanta.example.com>;tag=222
Call-ID: 6485356@chicago.example.com
CSeq: 1 ACK
Content-Length: 0
/* A replaces the session to the Park Server with the new session with C and generates a BYE to disconnect the Park Server */
F19 BYE Alice -> Park Server
BYE sip:park@server.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=098594
To: <sip:park@server.example.com>;tag=0111
Call-ID: a5-75-34-12-76@server.example.com
CSeq: 1 BYE
Content-Length: 0
F20 200 OK Park Server -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=098594
To: <sip:park@server.example.com>;tag=0111
Call-ID: a5-75-34-12-76@server.example.com
CSeq: 1 BYE
Content-Length: 0
2.16 Call Pickup
Alice Bob Carol
| | |
| INVITE F1 | |
|------------->| |
|180 Ringing F2| |
|<-------------| |
| | SUBSCRIBE F3 |
| |<------------------|
| | 200 OK F4 |
| |------------------>|
| | NOTIFY F5 |
Johnston, et al. Expires August 2, 2003 [Page 133]
Internet-Draft SIP Service Examples February 2003
| |------------------>|
| | 200 OK F6 |
| |<------------------|
| INVITE Replaces:Bob F7 |
|<---------------------------------|
| | 200 OK F8 |
|--------------------------------->|
| CANCEL F9 | |
|------------->| |
| 200 OK F10 | |
|<-------------| |
| 487 F11 | |
|<-------------| |
| ACK F12 | |
|------------->| |
| ACK F13 |
|<---------------------------------|
| | NOTIFY F14 |
| |------------------>|
| | 481 F15 |
| |<------------------|
| |
| Both way RTP Established |
|<================================>|
| BYE F16 |
|--------------------------------->|
| 200 OK F17 |
|<---------------------------------|
| |
Bob and Carol are part of a work group at example.com that can pick
up each others calls. Alice calls Bob who does not answer. Carol
wishes to pick up the call and sends a SUBSCRIBE to B to retrieve the
dialog information. Carol then generates an INVITE with a Replaces
to Alice. Alice answers the INVITE and sends a CANCEL to stop Bobs
phone ringing. Note that the order of the CANCEL/ACK sequence in F11
through F20 is not significant.
Message Details
F1 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
Johnston, et al. Expires August 2, 2003 [Page 134]
Internet-Draft SIP Service Examples February 2003
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 180 Ringing B1 -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=3145678
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@Bob.biloxi.example.com>
Content-Length: 0
/* Carol decides to pick up the call */
F3 SUBSCRIBE Carol -> Bob
SUBSCRIBE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP pc.biloxi.example.com:5060;branch=z9hG4bK74bf
Max-Forwards: 70
From: Carol <sip:carol@biloxi.example.com>;tag=8675309
To: Bob <sip:bob@biloxi.example.com>
Call-ID: rt4353gs2egg@pc.biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:carol@pc.biloxi.example.com>
Event: dialog
Subscription-State: active;expires=3600
Accept: application/dialog-info+xml
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 135]
Internet-Draft SIP Service Examples February 2003
F4 200 OK Bob -> Carol
SIP/2.0 200 OK
Via: SIP/2.0/UDP pc.biloxi.example.com:5060;branch=z9hG4bK74bf
;received=192.0.2.114
Max-Forwards: 70
From: Carol <sip:carol@biloxi.example.com>;tag=8675309
To: Bob <sip:bob@biloxi.example.com>;tag=31451098
Call-ID: rt4353gs2egg@pc.biloxi.example.com
CSeq: 1 INVITE
Content-Length: 0
F5 NOTIFY Bob -> Carol
NOTIFY sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP Bob.biloxi.example.com:5060;branch=z9hG4bK74bf
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=31451098
To: Carol <sip:carol@biloxi.example.com>;tag=8675309
Call-ID: rt4353gs2egg@pc.biloxi.example.com
CSeq: 1 NOTIFY
Contact: <sip:carol@Bob.biloxi.example.com>
Event: dialog
Subscription-State: active;expires=3600
Content-Type: application/dialog-info+xml
Content-Length: ...
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="0" state="full" entity="sip:bob@biloxi.example.com">
<dialog id="94992014524" call-id="12345600@atlanta.example.com"
local-tag="3145678" remote-tag="1234567" direction="recipient"
remote-uri="alice@atlanta.example.com">
<state>early</state>
</dialog>
</dialog-info>
F6 200 OK Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP Bob.biloxi.example.com:5060;branch=z9hG4bK74bf
From: Bob <sip:bob@biloxi.example.com>;tag=31451098
To: Carol <sip:carol@biloxi.example.com>;tag=8675309
Call-ID: rt4353gs2egg@pc.biloxi.example.com
CSeq: 1 NOTIFY
Contact: <sip:carol@Bob.biloxi.example.com>
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 136]
Internet-Draft SIP Service Examples February 2003
F7 INVITE Carol -> Alice
INVITE sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP pc.biloxi.example.com:5060;branch=z9hG4bK74bf
Max-Forwards: 70
From: Carol <sip:carol@biloxi.example.com>;tag=8675309
To: Alice <sip:alice@atlanta.example.com>
Call-ID: 563456212@b2.biloxi.example.com
CSeq: 1 INVITE
Replaces: 12345600@atlanta.example.com;to-tag=314578;from-tag=1234567
Contact: <sip:bob@client2.biloxi.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890843122 2890843122 IN IP4 pc.biloxi.example.com
s=Session SDP
c=IN IP4 client2.biloxi.example.com
t=3034423619 0
m=audio 5342 RTP/AVP 0
a=rtpmap:0 PCMU/8000
/* Alice matches the dialog information in the Replaces header and accepts the INVITE */
F8 200 OK Alice -> Carol
SIP/2.0 200 OK
Via: SIP/2.0/UDP pc.biloxi.example.com:5060;branch=z9hG4bK74bf
;received=192.0.2.114
From: Carol <sip:carol@atlanta.example.com>;tag=8675309
To: Alice <sip:alice@atlanta.example.com>;tag=131256
Call-ID: 563456212@b2.biloxi.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 289084543 289084543 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=0 0
m=audio 49172 RTP/AVP 0
Johnston, et al. Expires August 2, 2003 [Page 137]
Internet-Draft SIP Service Examples February 2003
a=rtpmap:0 PCMU/8000
/* Alice stops Bobs phone from ringing by sending a CANCEL */
F9 CANCEL Alice -> Bob
CANCEL sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 CANCEL
Content-Length: 0
F10 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 CANCEL
Content-Length: 0
F11 487 Request Terminated Bob -> Proxy
SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=3145678
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F12 ACK Alice -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP ss1.example.com:5060;branch=z9hG4bK83749.1
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
Johnston, et al. Expires August 2, 2003 [Page 138]
Internet-Draft SIP Service Examples February 2003
To: Bob <sip:bob@biloxi.example.com>;tag=3145678
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
Content-Length: 0
F13 ACK Carol -> Alice
ACK sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP b2.biloxi.example.com:5060;branch=z9hG4bK74bf
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Alice <sip:alice@atlanta.example.com>;tag=131256
Call-ID: 563456212@b2.biloxi.example.com
CSeq: 1 ACK
Content-Length: 0
F14 NOTIFY Bob -> Carol
NOTIFY sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP Bob.biloxi.example.com:5060;branch=z9hG4bK74bf
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=31451098
To: Carol <sip:carol@biloxi.example.com>;tag=8675309
Call-ID: rt4353gs2egg@pc.biloxi.example.com
CSeq: 2 NOTIFY
Contact: <sip:carol@Bob.biloxi.example.com>
Event: dialog
Subscription-State: active;expires=3600
Content-Type: application/dialog-info+xml
Content-Length: ...
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="1" state="partial" entity="sip:bob@biloxi.example.com">
<dialog id="94992014524" call-id="12345600@atlanta.example.com"
local-tag="3145678" remote-tag="1234567" direction="recipient">
<state>terminated</state>
</dialog>
</dialog-info>
F15 481 Dialog Does Not Exist Carol -> Bob
SIP/2.0 481 Dialog Does Not Exist
Johnston, et al. Expires August 2, 2003 [Page 139]
Internet-Draft SIP Service Examples February 2003
Via: SIP/2.0/UDP bob.biloxi.example.com:5060;branch=z9hG4bK74bf
From: Bob <sip:bob@biloxi.example.com>;tag=31451098
To: Carol <sip:carol@biloxi.example.com>;tag=8675309
Call-ID: rt4353gs2egg@pc.biloxi.example.com
CSeq: 2 NOTIFY
Contact: <sip:carol@bob.biloxi.example.com>
Content-Length: 0
/* RTP streams are established between Alice and Carol. Alice Hangs Up with Bob. */
F16 BYE Alice -> Proxy
BYE sip:carol@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
To: Bob <sip:bob@biloxi.example.com>;tag=8675309
From: Alice <sip:alice@atlanta.example.com>;tag=131256
Call-ID: 563456212@b2.biloxi.example.com
CSeq: 2 BYE
Content-Length: 0
F17 200 OK Carol -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
To: Bob <sip:bob@biloxi.example.com>;tag=8675309
From: Alice <sip:alice@atlanta.example.com>;tag=131256
Call-ID: 563456212@b2.biloxi.example.com
CSeq: 2 BYE
Content-Length: 0
2.17 Automatic Redial
Johnston, et al. Expires August 2, 2003 [Page 140]
Internet-Draft SIP Service Examples February 2003
Alice Bob
| |
| INVITE F1 |
|--------------->|
|486 Busy Here F2|
|<---------------| Bob is busy
| ACK F3 |
|--------------->|
| SUBSCRIBE F4 |
|--------------->|
| 200 OK F5 |
|<---------------|
| NOTIFY F6 |
|<---------------|
| 200 OK F7 |
|--------------->|
| |
| NOTIFY F8 | Bob is now available
|<---------------|
| 200 OK F9 |
|--------------->|
| |
| INVITE F10 |
|--------------->| Session setup successfully
| 180 Ringing F11|
|<---------------|
| 200 OK F12 |
|<---------------|
| ACK F13 |
|--------------->|
| Media Session |
|<==============>|
| |
Bob is initially busy when Alice calls. Alice subscribes to User
Bs call state using a SUBSCRIBE F4. Bob sends a NOTIFY F8 when
Bob is available. A is alerted, then Alice sends an INVITE to B to
establish the session.
Message Details
F1 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
Johnston, et al. Expires August 2, 2003 [Page 141]
Internet-Draft SIP Service Examples February 2003
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F2 486 Busy Here
SIP/2.0 486 Busy Here
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=982039i4
Call-ID: 12345600@atlanta.example.com
CSeq: 1 INVITE
Content-Length: 0
F3 ACK Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=982039i4
Call-ID: 12345600@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
F4 SUBSCRIBE Alice -> Bob
SUBSCRIBE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=837348234
To: Bob <sip:bob@biloxi.example.com>
Johnston, et al. Expires August 2, 2003 [Page 142]
Internet-Draft SIP Service Examples February 2003
Call-ID: 4524526232@atlanta.example.com
CSeq: 1 SUBSCRIBE
Contact: alice@client.atlanta.example.com
Event: dialog
Subscription-State: active;expires=3600
Accept: application/dialog-info+xml
Content-Length: 0
F5 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
From: Alice <sip:alice@atlanta.example.com>;tag=837348234
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 4524526232@atlanta.example.com
CSeq: 1 SUBSCRIBE
Contact: alice@client.biloxi.example.com
Content-Length: 0
F6 NOTIFY Bob -> Alice
NOTIFY sip:alice@atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=341123
To: Alice <sip:alice@atlanta.example.com>;tag=837348234
Call-ID: 4524526232@atlanta.example.com
CSeq: 1 NOTIFY
Event: dialog
Subscription-State: active;expires=3600
Content-Type: application/dialog-info+xml
Content-Length: ...
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="0" state="full" entity="sip:bob@biloxi.example.com">
<dialog id="562623442g3">
<state>confirmed</state>
</dialog>
</dialog-info>
F7 200 OK Alice -> Bob
Johnston, et al. Expires August 2, 2003 [Page 143]
Internet-Draft SIP Service Examples February 2003
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
From: Bob <sip:bob@biloxi.example.com>;tag=341123
To: Alice <sip:alice@atlanta.example.com>;tag=837348234
Call-ID: 4524526232@atlanta.example.com
CSeq: 1 NOTIFY
Content-Length: 0
/* Bob is now available */
F8 NOTIFY Bob -> Alice
NOTIFY sip:alice@atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=341123
To: Alice <sip:alice@atlanta.example.com>;tag=837348234
Call-ID: 4524526232@atlanta.example.com
CSeq: 2 NOTIFY
Event: dialog
Subscription-State: active;expires=3600
Content-Type: application/dialog-info+xml
Content-Length: ...
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info"
version="0" state="full" entity="sip:bob@biloxi.example.com">
<dialog id="562623442g3">
<state>terminated</state>
</dialog>
</dialog-info>
F9 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
From: Bob <sip:bob@biloxi.example.com>;tag=341123
To: Alice <sip:alice@atlanta.example.com>;tag=837348234
Call-ID: 4524526232@atlanta.example.com
CSeq: 2 NOTIFY
Content-Length: 0
<figure><artwork><![CDATA[
Message Details
Johnston, et al. Expires August 2, 2003 [Page 144]
Internet-Draft SIP Service Examples February 2003
F10 INVITE Alice -> Bob
INVITE sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=f23fkg14k
To: Bob <sip:bob@biloxi.example.com>
Call-ID: aoij4i9okitr@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:alice@client.atlanta.example.com>
Content-Type: application/sdp
Content-Length: ...
v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=Session SDP
c=IN IP4 client.atlanta.example.com
t=3034423619 0
m=audio 49170 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F11 180 Ringing Bob -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=f23fkg14k
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: aoij4i9okitr@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Length: 0
F12 200 OK Bob -> Alice
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sip:alice@atlanta.example.com>;tag=f23fkg14k
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: aoij4i9okitr@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Content-Type: application/sdp
Content-Length: ...
Johnston, et al. Expires August 2, 2003 [Page 145]
Internet-Draft SIP Service Examples February 2003
v=0
o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F13 ACK Alice -> Bob
ACK sip:bob@client.biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip:alice@atlanta.example.com>;tag=f23fkg14k
To: Bob <sip:bob@biloxi.example.com>;tag=23431
Call-ID: aoij4i9okitr@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 146]
Internet-Draft SIP Service Examples February 2003
2.18 Click to Dial
Bob's PC Bob Carol
| REFER Refer-To:Carol F1 |
|------------------->| |
| 202 Accepted F2 | |
|<-------------------| |
| NOTIFY F3 | |
|<-------------------| |
| 200 OK F4 | |
|------------------->| |
| | INVITE F5 |
| |------------------->|
| | 180 Ringing F6 |
| |<-------------------|
| | 200 OK F7 |
| |<-------------------|
| | ACK F8 |
| |------------------->|
| | RTP |
| |<==================>|
| | |
In this example, while browsing the web on his PC, Bob clicks on
Carol's SIP URI intending to establish a session with Carol. Bob's
web browser passes the SIP URI to the SIP client on Bob's PC. The PC
client is configured with the URI of Bob's SIP phone. A REFER is
sent to the SIP phone which results in the establishment of the
session between Bob and Carol.
Note that Bob's SIP phone immediately terminates the dialog by
indicating in the NOTIFY (F3) that the subscription is terminated.
Message Details
/* Bob's PC SIP Client sends a REFER to Bob's SIP phone */
F1 REFER PC -> Bob
REFER sip:bob@biloxi.example.com SIP/2.0
Via: SIP/2.0/UDP pc.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: <sip:pc.biloxi.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>
Call-ID: 12345601@atlanta.example.com
CSeq: 1 REFER
Johnston, et al. Expires August 2, 2003 [Page 147]
Internet-Draft SIP Service Examples February 2003
Refer-To: <sip:carol@chicago.example.com>
Contact: <sip:pc.client.atlanta.example.com>
Content-Length: 0
F2 202 Accepted Bob -> PC
SIP/2.0 202 Accepted
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: <sip:pc.biloxi.example.com>;tag=1234567
To: Bob <sip:bob@biloxi.example.com>;tag=314159
Call-ID: 12345601@atlanta.example.com
CSeq: 1 REFER
Content-Length: 0
F3 NOTIFY Bob -> Alice
NOTIFY sip:alice@client.atlanta.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: <sip:pc.biloxi.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 NOTIFY
Event: refer
Subscription-State: terminated;reason=noresource
Content-Type: message/sipfrag
Content-Length: ...
SIP/2.0 100 Trying
F4 200 OK Alice -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=314159
To: <sip:pc.biloxi.example.com>;tag=1234567
Call-ID: 12345601@atlanta.example.com
CSeq: 1 NOTIFY
Content-Length: 0
Johnston, et al. Expires August 2, 2003 [Page 148]
Internet-Draft SIP Service Examples February 2003
F5 INVITE Bob -> Carol
INVITE sip:carol@chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>
Call-ID: 7436222@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:bob@client.biloxi.example.com>
Referred-By: <alice@atlanta.example.com>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=bob 2890844539 2890844539 IN IP4 client.biloxi.example.com
s=Session SDP
c=IN IP4 client.biloxi.example.com
t=3034423821 0
m=audio 3458 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F6 180 Ringing Carol -> Bob
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=928287
Call-ID: 7436222@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Content-Length: 0
F7 200 OK Carol -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
;received=192.0.2.113
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=928287
Call-ID: 7436222@atlanta.example.com
CSeq: 1 INVITE
Contact: <sip:carol@client.chicago.example.com>
Johnston, et al. Expires August 2, 2003 [Page 149]
Internet-Draft SIP Service Examples February 2003
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: ...
v=0
o=carol 2890844527 2890844527 IN IP4 client.chicago.example.com
s=Session SDP
c=IN IP4 client.chicago.example.com
t=3034423619 0
m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000
F8 ACK Bob -> Carol
ACK sip:carol@client.chicago.example.com SIP/2.0
Via: SIP/2.0/UDP client.biloxi.example.com:5060;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sip:bob@biloxi.example.com>;tag=8675309
To: Carol <sip:carol@chicago.example.com>;tag=928287
Call-ID: 7436222@atlanta.example.com
CSeq: 1 ACK
Content-Length: 0
/* Bob and Carol now have established a session. */
3. Security Considerations
Since many of the examples in this document involve SIP call control,
either peer-to-peer or 3pcc, the security considerations in the
Multiparty Framework document [12] apply.
4. IANA Considerations
None.
5. Acknowledgements
The Automatic Call Back call flow is based on a call flow by Adam
Roach. The Single Line Extension call flow is based on a call flow
by Jonathan Rosenberg. The authors wish to thank the following
individuals for their assistance and review of this call flows
document: Rohan Mahey, Jonathan Rosenberg, Hemant Agrawal, Henry
Sinnreich, Dean Willis, David Devanatham, Joe Pizzimenti, Matt
Cannon, John Hearty, the whole MCI WorldCom IPOP Design team, Scott
Johnston, et al. Expires August 2, 2003 [Page 150]
Internet-Draft SIP Service Examples February 2003
Orton, Greg Osterhout, Pat Sollee, Doug Weisenberg, Danny Mistry,
Steve McKinnon, and Denise Ingram, Denise Caballero, Tom Redman, Ilya
Slain, Pat Sollee, John Truetken, and others from MCI WorldCom, 3Com,
Cisco, Lucent and Nortel.
6. Document History
The first version of this document was the Internet-Draft
draft-sparks-sip-service-examples October 1999.
The next version was combined with the SIP Telephony Call Flows
document into the draft-ietf-sip-call-flows April 2000.
The current version was renamed as a work item of the SIPPING WG.
6.1 Changes since -03
- Added Click to Dial Call Flow
- Changed URIs and display names
- Added a=recvonly attribute in hold SDP answers
Informative References
[1] Bradner, S., "The Internet Standards Process -- Revision 3",
BCP 9, RFC 2026, October 1996.
[2] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A.,
Peterson, J., Sparks, R., Handley, M. and E. Schooler, "SIP:
Session Initiation Protocol", RFC 3261, June 2002.
[3] Johnston, A., "Session Initiation Protocol Basic Call Flow
Examples", draft-ietf-sipping-basic-call-flows-01 (work in
progress), October 2002.
[4] Sparks, R., "The SIP Refer Method", draft-ietf-sip-refer-07
(work in progress), December 2002.
[5] Dean, R., Biggs, B. and R. Mahy, "The Session Inititation
Protocol (SIP) 'Replaces' Header", draft-ietf-sip-replaces-02
(work in progress), May 2002.
[6] Mahy, R. and D. Petrie, "The Session Inititation Protocol (SIP)
'Join' Header", draft-ietf-sip-join-00 (work in progress),
October 2002.
Johnston, et al. Expires August 2, 2003 [Page 151]
Internet-Draft SIP Service Examples February 2003
[7] Rosenberg, J., Schulzrinne, H., Camarillo, G. and J. Peterson,
"Best Current Practices for Third Party Call Control in the
Session Initiation Protocol", draft-ietf-sipping-3pcc-02 (work
in progress), June 2002.
[8] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model with
Session Description Protocol (SDP)", RFC 3264, June 2002.
[9] Sparks, R. and A. Johnston, "Session Initiation Protocol Call
Control - Transfer", draft-ietf-sipping-cc-transfer-01 (work in
progress), February 2003.
[10] Rosenberg, J. and H. Schulzrinne, "A Session Initiation
Protocol (SIP) Event Package for Dialog State",
draft-ietf-sipping-dialog-package-00 (work in progress), June
2002.
[11] Roach, A., "Session Initiation Protocol (SIP)-Specific Event
Notification", RFC 3265, June 2002.
[12] Mahy, R., "A Multi-party Application Framework for SIP",
draft-ietf-sipping-cc-framework-01 (work in progress), July
2002.
Authors' Addresses
Alan Johnston
WorldCom
100 South 4th Street
St. Louis, MO 63104
EMail: alan.johnston@wcom.com
Robert J. Sparks
dynamicsoft
5100 Tennyson Parkway
Suite 1200
Plano, TX 75024
EMail: rsparks@dynamicsoft.com
Johnston, et al. Expires August 2, 2003 [Page 152]
Internet-Draft SIP Service Examples February 2003
Chris Cunningham
dynamicsoft
5100 Tennyson Parkway
Suite 1200
Plano, TX 75024
EMail: ccunningham@dynamicsoft.com
Steve Donovan
dynamicsoft
5100 Tennyson Parkway
Suite 1200
Plano, TX 75024
EMail: sdonovan@dynamicsoft.com
Kevin Summers
Sonus
1701 North Collins Blvd
Suite 3000
Richardson, TX 75080
EMail: kevin.summers@sonusnet.com
Johnston, et al. Expires August 2, 2003 [Page 153]
Internet-Draft SIP Service Examples February 2003
Intellectual Property Statement
The IETF takes no position regarding the validity or scope of any
intellectual property or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; neither does it represent that it
has made any effort to identify any such rights. Information on the
IETF's procedures with respect to rights in standards-track and
standards-related documentation can be found in BCP-11. Copies of
claims of rights made available for publication and any assurances of
licenses to be made available, or the result of an attempt made to
obtain a general license or permission for the use of such
proprietary rights by implementors or users of this specification can
be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights which may cover technology that may be required to practice
this standard. Please address the information to the IETF Executive
Director.
Full Copyright Statement
Copyright (C) The Internet Society (2003). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assignees.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
Johnston, et al. Expires August 2, 2003 [Page 154]
Internet-Draft SIP Service Examples February 2003
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Johnston, et al. Expires August 2, 2003 [Page 155]