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-11

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MMUSIC WG                                               M. Garcia-Martin
Internet-Draft                                                  Ericsson
Intended status: Standards Track                         S. Veikkolainen
Expires: November 15, 2012                                         Nokia
                                                            May 14, 2012

 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-11

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
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   This Internet-Draft will expire on November 15, 2012.

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   document authors.  All rights reserved.

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   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
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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 . . . . . . . . . . . . . . . . . . 10
       5.2.3.  Correlating the PSTN Circuit-Switched Bearer with
               SDP  . . . . . . . . . . . . . . . . . . . . . . . . . 12
         5.2.3.1.  The "cs-correlation" attribute . . . . . . . . . . 12
         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
     5.3.  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 successful correlation . . . . . . . 18
     5.4.  Considerations for Usage of Existing SDP . . . . . . . . . 19