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Session Initiation Protocol (sip)
(concluded WG)

Note: The data for concluded WGs is occasionally incorrect.
Group
Name: Session Initiation Protocol
Acronym:sip
Area:Real-time Applications and Infrastructure Area (rai)
State: Concluded
Charter: charter-ietf-sip-04 (Approved)
More info: Additional SIP Page
Personnel
Chairs: Keith Drage <keith.drage@alcatel-lucent.com>
Dean Willis <dean.willis@softarmor.com>
Tech Advisor: Dan Romascanu <dromasca@avaya.com>
Mailing List
Address:sip@ietf.org
To Subscribe:sip-request@ietf.org
Archive:http://www.ietf.org/mail-archive/web/sip/

Charter for Working Group


The Session Initiation Protocol (SIP) working group is chartered to
maintain and continue the development of SIP, currently specified as
proposed standard RFC 3261, and its family of extensions.

SIP is a text-based protocol, similar to HTTP and SMTP, for
initiating interactive communication sessions between users.
Such sessions include voice, video, chat, interactive games, and
virtual reality. The main tasks of the group involve bringing SIP
from proposed to draft standard and specifying and developing
proposed extensions that arise out of strong requirements. The SIP
working group will concentrate on the specification of SIP and its
extensions, and will not explore the use of SIP for specific
environments or applications. It will, however respond to general-
purpose requirements for changes to SIP provided by other working
groups, including the SIPPING working group, when those
requirements are within the scope and charter of SIP. The process and
requirements for such extensions are documented in RFC 3427, "Change
Process for the Session Initiation Protocol".

Throughout its work, the group will strive to maintain the basic model
and architecture defined by SIP. In particular:

1. Services and features are provided end-to-end whenever possible.

2. Standards-track extensions and new features must be generally
applicable, and not applicable only to a specific set of session types.

3. Simplicity is key.

4. Reuse of existing Internet protocols and architectures and
integrating
with other Internet applications is crucial.

The primary source of change requirements to be considered by the SIP
Working Group is the SIPPING working group, which
analyzes the requirements for application of SIP to several different
tasks, including the tasks of standards-development organizations
that are developing systems based on SIP and that may require changes
or extensions thereto. Additional requirements are produced by the
other IETF working groups that are using SIP, including the SIMPLE WG
(which is using SIP for messaging and presence) and the XCON working
group (which is using SIP for centralized conferencing).

In addition to extending SIP as required to address these externally-
derived requirements, the deliverables of the group include assuring
capable security and privacy mechanisms within SIP and increasing
the stability of the SIP specification.

Specific deliverables toward these goals include:

1. Mechanisms for secure expression of identity in requests and
responses.

2. Mechanism to securely request services delivery by non-terminal
elements ("end-to-middle").

3. Guidelines for use of existing security mechanisms such as TLS,
IPsec, and certificates.

4. Guidelines for the use of descriptive techniques such as SAML
(Security Association Markup Language) with SIP.

5. Draft standard versions of SIP and critical supporting
specifications.

Other deliverables may be agreed upon as extensions are understood
to be necessary. Prospective deliverables will be discussed
with the Area Director before inclusion on agendas, and new
proposed work must be approved via a charter update.

Milestones

Done
Server Features Negotiation submitted to IESG
Done
Complete IESG requested fixes to provrel and servfeat
Done
Revised proposed standard version of SIP (2543bis) submitted to IESG
Done
SIP Events specification to IESG
Done
The UPDATE Method submitted for Proposed Standard
Done
SIP extensions for media authorization (call-auth) submitted as Informational
Done
Preconditions extensions (manyfolks) spec to IESG
Done
SIP Privacy specification to IESG
Done
SIP Privacy and Security Requirements to IESG
Done
The MESSAGE Method submitted for Proposed Standard
Done
The Replaces Header submitted for Proposed Standard
Done
Refer spec to IESG
Done
SIP NAT extension submitted to IESG
Done
SIP over SCTP specification and applicability statement
Done
Mechanism for Content Indirection in SIP submitted to IESG for Proposed Standard
Done
The SIP Referred-By Header submitted to IESG for Proposed Standard
Done
Session Timer spec, revised to IESG
Done
Caller preferences specification submitted to IESG
Done
Submit SIP Identity documents to IESG for Proposed Standard
Done
The SIP Join Header submitted to IESG for Proposed Standard
Done
Upgrade S/MIME requirement for AES in 3261 to IESG (PS)
Done
Replaces header to IESG (PS)
Done
Application Interaction to IESG (BCP)
Done
Resource Priority signaling mechanism to IESG (PS)
Done
Presence Publication to IESG (PS)
Done
Guidelines for Authors of SIP extensions submitted as Informational
Done
Enhancements for Authenticated Identity Management to IESG (BCP)
Done
MIB spec to IESG
Done
Request History mechanism to IESG (PS)
Done
Mechanism for REFER without implicit SUBSCRIBE to IESG (PS)
Done
Mechanism for Target-Dialog to IESG (PS)
Done
Mechanism for feature parameters with REFER To IESG (PS)
Done
Mechanism for End-to-Middle Requests to IESG (PS)
Done
Consent-Based Communications WGLC (PS)
Done
Mechanism for connected identity to WGLC (PS)
Done
Certificate Management Service for SIP to WGLC (PS)
Done
Rejecting Anonymous Requests to WGLC (PS)
Done
Rejecting Anonymous Requests to IESG (PS)
Done
Mechanism for connected identity to IESG (PS)
Done
Addressing an Amplification Vulnerability in Forking Proxies to IESG (PS)
Done
Refering to Multiple Resources to IESG as PS
Done
Signaling support for ICE to WGLC (PS)
Done
Submit Answering/Alerting Modes to the IESG (PS)
Done
Mechanism and guidelines for outbound connections to WGLC (PS)
Done
Location Conveyance with SIP to WGLC (PS)
Done
Mechanism for obtaining globally routable unique URIs (GRUU) to IESG (PS)
Done
Corrections to the SIPS Specification to WGLC (PS)
Done
Mechanism and guidelines for outbound connections to IESG (PS)
Done
Consent-Based Communications to IESG (PS)
Done
Certificate Management Service for SIP to IESG (PS)
Done
Signaling support for ICE to IESG (PS)
Done
Extensions to SIP UA Profile Delivery Change Notification Event Package for XCAP to WGLC (PS)
Done
Connection reuse mechanism to IESG (PS)
Done
Session Policies to WGLC as PS
Done
Extension for use of etags in conditional notification to WGLC
Done
Session Policies to IESG as PS
Done
Corrections to the SIPS Specification to IESG (PS)
Done
New resource priority namespaces for DISA to WGLC (PS)
Done
Requirements for media keying to WGLC (Informational)
Done
New resource priority namespaces for DISA to IESG (PS)
Done
X.509 Certificates for TLS use in SIP to WGLC (Info)
Done
X.509 extended key usage for SIP to WGLC (PS)
Done
Requirements for media keying to IESG (Informational)
Done
Extensions to SIP UA Profile Delivery Change Notification Event Package for XCAP to IESG (PS)
Done
Roadmap for SIP to WGLC (Informational)
Done
Roadmap for SIP to IESG (Informational)
Dec 2007
Extension for use in etags in conditional notification to IESG (PS)
Done
Establishment of secure media sessions using DTLS-SRTP to WGLC (PS)
Done
MIME body handling in SIP to WGLC (PS)
Done
Establishment of secure media sessions using DTLS-SRTP to IESG (PS)
Done
Guidelines for double route recording to WGLC (BCP)
Aug 2008
Guidelines for double route recording to IESG (BCP)
Sep 2008
X.509 Certificates for TLS use in SIP to IESG (PS)
Sep 2008
X.509 extended key usage for SIP to IESG (PS)
Done
Termination of early dialog prior to final response to WGLC (PS)
Done
Using SAML for SIP to WGLC (Exp)
Nov 2008
Termination of early dialog prior to final response to IESG (PS)
Dec 2008
Location Conveyance with SIP to IESG (PS)
Dec 2008
Using SAML for SIP to IESG (Exp)
Dec 2008
Delivering request-URI and parameters to UAS via proxy to WGLC (PS)
Jan 2009
MIME body handling in SIP to IESG (PS)
Feb 2009
Delivering request-URI and parameters to UAS via proxy to IESG (PS)
Done
Mechanisms for UA initiated privacy to WGLC (BCP)
Done
INFO package framework to WGLC (PS)
Mar 2009
Example security flows to WGLC (Informational)
Mar 2009
Identify requirements for test matrix to move SIP to Draft Standard
Mar 2009
Revise charter
Mar 2009
Essential corrections to RFC 3261 (1st batch) to IESG (PS)
Apr 2009
Mechanisms for UA initiated privacy to IESG (BCP)
Apr 2009
INFO package framework to IESG (PS)
Jul 2009
Example security flows to IESG (Informational)