Offer/Answer Considerations for G.723 Annex A and G.729 Annex B
draft-ietf-mmusic-sdp-g723-g729-02

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Document Type Active Internet-Draft (mmusic WG)
Last updated 2013-06-04
Replaces draft-ietf-mmusic-sdp-g273-g729
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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: December 5, 2013                                   June 3, 2013

    Offer/Answer Considerations for G.723 Annex A and G.729 Annex B
                   draft-ietf-mmusic-sdp-g723-g729-02

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 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 December 5, 2013                [Page 1]
Internet-Draft   Offer/Answer G723 AnnexA & G729 AnnexB        June 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 G.729 Annex B, G.729D
           Annex B and G.729E 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

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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 offer and
   answer.  For example, if the offer has G729 with annexb=yes and the
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