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-21

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MMUSIC WG                                               M. Garcia-Martin
Internet-Draft                                                  Ericsson
Intended status: Standards Track                         S. Veikkolainen
Expires: December 28, 2013                                         Nokia
                                                           June 26, 2013

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-21

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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 28, 2013.

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   document authors.  All rights reserved.

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Garcia-Martin & VeikkolaExpires December 28, 2013               [Page 1]
Internet-Draft    PSTN Circuit-Switched Bearers in SDP         June 2013

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   4
   3.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Overview of Operation . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Example Call Flow . . . . . . . . . . . . . . . . . . . .   5
   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 . . . . . . . . .  11
         5.2.3.3.  User-User Information Element Correlation
                   Mechanism . . . . . . . . . . . . . . . . . . . .  12
         5.2.3.4.  DTMF Correlation Mechanism  . . . . . . . . . . .  14
         5.2.3.5.  Extensions to correlation mechanisms  . . . . . .  15
     5.3.  Negotiating the correlation mechanisms  . . . . . . . . .  15
       5.3.1.  Determining the Direction of the    Circuit-Switched
               Bearer Setup  . . . . . . . . . . . . . . . . . . . .  15
       5.3.2.  Populating the cs-correlation attribute . . . . . . .  16
       5.3.3.  Considerations on correlations  . . . . . . . . . . .  17
     5.4.  Considerations for Usage of Existing SDP  . . . . . . . .  18
       5.4.1.  Originator of the Session . . . . . . . . . . . . . .  18
       5.4.2.  Contact information . . . . . . . . . . . . . . . . .  18
     5.5.  Considerations for Usage of Third Party Call Control
           (3PCC)  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     5.6.  Offer/Answer mode extensions  . . . . . . . . . . . . . .  19
       5.6.1.  Generating the Initial Offer  . . . . . . . . . . . .  19
       5.6.2.  Generating the Answer . . . . . . . . . . . . . . . .  21
       5.6.3.  Offerer processing the Answer . . . . . . . . . . . .  24
       5.6.4.  Modifying the session . . . . . . . . . . . . . . . .  26
     5.7.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . .  26
   6.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  27
     6.1.  Single PSTN audio stream  . . . . . . . . . . . . . . . .  27