Session Description Protocol (SDP) Extension For Setting Up Audio and Video Media Streams Over Circuit-Switched Bearers In The Public Switched Telephone Network (PSTN)
draft-ietf-mmusic-sdp-cs-17

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MMUSIC WG                                               M. Garcia-Martin
Internet-Draft                                                  Ericsson
Intended status: Standards Track                         S. Veikkolainen
Expires: July 18, 2013                                             Nokia
                                                        January 14, 2013

 Session Description Protocol (SDP) Extension For Setting Up Audio and
Video Media Streams Over Circuit-Switched Bearers In The Public Switched
                        Telephone Network (PSTN)
                      draft-ietf-mmusic-sdp-cs-17

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 July 18, 2013.

Copyright Notice

   Copyright (c) 2013 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
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   include Simplified BSD License text as described in Section 4.e of

Garcia-Martin & Veikkolainen  Expires July 18, 2013             [Page 1]
Internet-Draft    PSTN Circuit-Switched Bearers in SDP      January 2013

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

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  6
   3.  Requirements . . . . . . . . . . . . . . . . . . . . . . . . .  6
   4.  Overview of Operation  . . . . . . . . . . . . . . . . . . . .  7
     4.1.  Example Call Flow  . . . . . . . . . . . . . . . . . . . .  7
   5.  Protocol Description . . . . . . . . . . . . . . . . . . . . .  9
     5.1.  Level of Compliance  . . . . . . . . . . . . . . . . . . .  9
     5.2.  Extensions to SDP  . . . . . . . . . . . . . . . . . . . .  9
       5.2.1.  Connection Data  . . . . . . . . . . . . . . . . . . .  9
       5.2.2.  Media Descriptions . . . . . . . . . . . . . . . . . . 11
       5.2.3.  Correlating the PSTN Circuit-Switched Bearer with
               SDP  . . . . . . . . . . . . . . . . . . . . . . . . . 12
         5.2.3.1.  The "cs-correlation" attribute . . . . . . . . . . 13
         5.2.3.2.  Caller-ID Correlation Mechanism  . . . . . . . . . 13
         5.2.3.3.  User-User Information Element Correlation
                   Mechanism  . . . . . . . . . . . . . . . . . . . . 14
         5.2.3.4.  DTMF Correlation Mechanism . . . . . . . . . . . . 16
         5.2.3.5.  Extensions to correlation mechanisms . . . . . . . 17
     5.3.  Negotiating the correlation mechanisms . . . . . . . . . . 17
       5.3.1.  Determining the Direction of the Circuit-Switched
               Bearer Setup . . . . . . . . . . . . . . . . . . . . . 17
       5.3.2.  Populating the cs-correlation attribute  . . . . . . . 18
       5.3.3.  Considerations on correlations . . . . . . . . . . . . 19
     5.4.  Considerations for Usage of Existing SDP . . . . . . . . . 19
       5.4.1.  Originator of the Session  . . . . . . . . . . . . . . 19
       5.4.2.  Contact information  . . . . . . . . . . . . . . . . . 20
     5.5.  Considerations for Usage of Third Party Call Control
           (3PCC) . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     5.6.  Offer/Answer mode extensions . . . . . . . . . . . . . . . 21
       5.6.1.  Generating the Initial Offer . . . . . . . . . . . . . 21
       5.6.2.  Generating the Answer  . . . . . . . . . . . . . . . . 23
       5.6.3.  Offerer processing the Answer  . . . . . . . . . . . . 26
       5.6.4.  Modifying the session  . . . . . . . . . . . . . . . . 27