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Session Description Protocol (SDP) Extension For Setting Audio and Video Media Streams Over Circuit-Switched Bearers In The Public Switched Telephone Network (PSTN)
draft-ietf-mmusic-sdp-cs-23

Document type: Active Internet-Draft (mmusic WG)
Document stream: IETF
Last updated: 2014-03-04 (latest revision 2014-02-11)
Intended RFC status: Proposed Standard
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Unknown
Document shepherd: Flemming Andreasen

IESG State: RFC Ed Queue
IANA Review State: IANA OK - Actions Needed
IANA Action State: RFC-Ed-Ack
RFC Editor State: AUTH48
Responsible AD: Gonzalo Camarillo
IESG Note: Flemming Andreasen (fandreas@cisco.com) is the document shepherd.
Send notices to: mmusic-chairs@tools.ietf.org, draft-ietf-mmusic-sdp-cs@tools.ietf.org

MMUSIC WG                                               M. Garcia-Martin
Internet-Draft                                                  Ericsson
Intended status: Standards Track                         S. Veikkolainen
Expires: August 15, 2014                                           Nokia
                                                       February 11, 2014

Session Description Protocol (SDP) Extension For Setting Audio and Video
   Media Streams Over Circuit-Switched Bearers In The Public Switched
                        Telephone Network (PSTN)
                      draft-ietf-mmusic-sdp-cs-23

Abstract

   This memo describes use cases, requirements, and protocol extensions
   for using the Session Description Protocol (SDP) Offer/Answer model
   for establishing audio and video media streams over circuit-switched
   bearers in the Public Switched Telephone Network (PSTN).

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on August 15, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

Garcia-Martin & VeikkolaiExpires August 15, 2014                [Page 1]
Internet-Draft    PSTN Circuit-Switched Bearers in SDP     February 2014

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   4
   3.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Overview of Operation . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Example Call Flow . . . . . . . . . . . . . . . . . . . .   6
   5.  Protocol Description  . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Level of Compliance . . . . . . . . . . . . . . . . . . .   7
     5.2.  Extensions to SDP . . . . . . . . . . . . . . . . . . . .   7
       5.2.1.  Connection Data . . . . . . . . . . . . . . . . . . .   7
       5.2.2.  Media Descriptions  . . . . . . . . . . . . . . . . .   9
       5.2.3.  Correlating the PSTN Circuit-Switched Bearer with SDP  10
         5.2.3.1.  The "cs-correlation" attribute  . . . . . . . . .  11
         5.2.3.2.  Caller-ID Correlation Mechanism . . . . . . . . .  12
         5.2.3.3.  User-User Information Element Correlation
                   Mechanism . . . . . . . . . . . . . . . . . . . .  13
         5.2.3.4.  DTMF Correlation Mechanism  . . . . . . . . . . .  14
         5.2.3.5.  The external correlation mechanism  . . . . . . .  15
         5.2.3.6.  Extensions to correlation mechanisms  . . . . . .  16
     5.3.  Negotiating the correlation mechanisms  . . . . . . . . .  16
       5.3.1.  Determining the Direction of the    Circuit-Switched
               Bearer Setup  . . . . . . . . . . . . . . . . . . . .  17
       5.3.2.  Populating the cs-correlation attribute . . . . . . .  17
       5.3.3.  Considerations on correlations  . . . . . . . . . . .  18
     5.4.  Considerations for Usage of Existing SDP  . . . . . . . .  19
       5.4.1.  Originator of the Session . . . . . . . . . . . . . .  19
       5.4.2.  Contact information . . . . . . . . . . . . . . . . .  19
     5.5.  Considerations for Usage of Third Party Call Control
           (3PCC)  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     5.6.  Offer/Answer mode extensions  . . . . . . . . . . . . . .  20
       5.6.1.  Generating the Initial Offer  . . . . . . . . . . . .  20
       5.6.2.  Generating the Answer . . . . . . . . . . . . . . . .  23
       5.6.3.  Offerer processing the Answer . . . . . . . . . . . .  25
       5.6.4.  Modifying the session . . . . . . . . . . . . . . . .  27

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