Offer/Answer Considerations for G723 Annex A and G729 Annex B
draft-ietf-mmusic-sdp-g723-g729-04

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Document Type Active Internet-Draft (mmusic WG)
Last updated 2014-01-21 (latest revision 2013-07-14)
Replaces draft-ietf-mmusic-sdp-g273-g729
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Stream WG state Submitted to IESG for Publication Oct 2013
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Document shepherd Ari Keranen
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MMUSIC                                                Muthu A M. Perumal
Internet-Draft                                             Cisco Systems
Updates: 4856 (if approved)                     Parthasarathi. Ravindran
Intended status: Standards Track                  Nokia Siemens Networks
Expires: January 16, 2014                                  July 15, 2013

     Offer/Answer Considerations for G723 Annex A and G729 Annex B
                   draft-ietf-mmusic-sdp-g723-g729-04

Abstract

   RFC4856 describes the annexa parameter for G723 and the annexb
   parameter for G729, G729D and G729E. However, the specification does
   not describe the offerer and answerer behavior when the value of the
   annexa or annexb parameter does not match in the Session Description
   protocol(SDP) offer and answer.  This document provides the offer/
   answer considerations for these parameters and updates RFC4856.

Status of this Memo

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Perumal & Ravindran     Expires January 16, 2014                [Page 1]
Internet-Draft   Offer/Answer G723 AnnexA & G729 AnnexB        July 2013

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Offer/Answer Considerations . . . . . . . . . . . . . . . . . . 4
     3.1.  Offer/Answer Considerations for G723 Annex A  . . . . . . . 4
     3.2.  Offer/Answer Considerations for G729 Annex B, G729D
           Annex B and G729E Annex B . . . . . . . . . . . . . . . . . 4
   4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     4.1.  Offer with G729 annexb=yes and answer with G729
           annexb=no . . . . . . . . . . . . . . . . . . . . . . . . . 5
     4.2.  Offer with G729 annexb=yes and answer with G729 and no
           annexb parameter  . . . . . . . . . . . . . . . . . . . . . 6
     4.3.  Offer with G729 and no annexb parameter and answer
           with G729 annexb=no . . . . . . . . . . . . . . . . . . . . 6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
   7.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . . 7
   8.  Normative References  . . . . . . . . . . . . . . . . . . . . . 8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 8

Perumal & Ravindran     Expires January 16, 2014                [Page 2]
Internet-Draft   Offer/Answer G723 AnnexA & G729 AnnexB        July 2013

1.  Introduction

   [RFC4856] describes the annexa parameter for G723 as follows:

      annexa: indicates that Annex A, voice activity detection, is used
      or preferred.  Permissible values are "yes" and "no" (without the
      quotes); "yes" is implied if this parameter is omitted.

   Also, [RFC4856] describes the annexb parameter for G729, G729D and
   G729E as follows:

      annexb: indicates that Annex B, voice activity detection, is used
      or preferred.  Permissible values are "yes" and "no" (without the
      quotes); "yes" is implied if this parameter is omitted.

   However, it does not have any normative statement for the case where
   the value of this parameter does not match in the SDP [RFC4566] offer
   and answer.  For example, if the offer has G729 with annexb=yes and
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