draft-ietf-avt-rtp-g729-scal-wb-ext-05.txt   draft-ietf-avt-rtp-g729-scal-wb-ext-06.txt 
Network Working Group A. Sollaud Network Working Group A. Sollaud
Internet-Draft France Telecom Internet-Draft France Telecom
Expires: November 18, 2006 May 17, 2006 Expires: November 19, 2006 May 18, 2006
RTP payload format for the G.729.1 audio codec RTP payload format for the G.729.1 audio codec
draft-ietf-avt-rtp-g729-scal-wb-ext-05 draft-ietf-avt-rtp-g729-scal-wb-ext-06
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Copyright Notice Copyright Notice
Copyright (C) The Internet Society (2006). Copyright (C) The Internet Society (2006).
Abstract Abstract
This document specifies a real-time transport protocol (RTP) payload This document specifies a real-time transport protocol (RTP) payload
format to be used for the International Telecommunication Union format to be used for the International Telecommunication Union
(ITU-T) G.729.1 audio codec. A media type registration is included (ITU-T) G.729.1 audio codec. A media type registration is included
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procedures [8] to negotiate the use of G.729.1 payload in RTP: procedures [8] to negotiate the use of G.729.1 payload in RTP:
o Since G.729.1 is an extension of G.729, the offerer SHOULD o Since G.729.1 is an extension of G.729, the offerer SHOULD
announce G.729 support in its "m=audio" line, with G.729.1 announce G.729 support in its "m=audio" line, with G.729.1
preferred. This will allow interoperability with both G.729.1 and preferred. This will allow interoperability with both G.729.1 and
G.729-only capable parties. G.729-only capable parties.
Below is an example of such an offer: Below is an example of such an offer:
m=audio 55954 RTP/AVP 98 18 m=audio 55954 RTP/AVP 98 18
a=rtpmap:98 G729.1/16000 a=rtpmap:98 G7291/16000
a=rtpmap:18 G729/8000 a=rtpmap:18 G729/8000
If the answerer supports G.729.1, it will keep the payload type 98 If the answerer supports G.729.1, it will keep the payload type 98
in its answer and the conversation will be done using G.729.1. in its answer and the conversation will be done using G.729.1.
Else, if the answerer supports only G.729, it will leave only the Else, if the answerer supports only G.729, it will leave only the
payload type 18 in its answer and the conversation will be done payload type 18 in its answer and the conversation will be done
using G.729 (the payload format for G.729 is defined in Section using G.729 (the payload format for G.729 is defined in Section
4.5.6 of RFC 3551 [4]). 4.5.6 of RFC 3551 [4]).
Note that when used at 8 kbps in G.729-compatible mode, the Note that when used at 8 kbps in G.729-compatible mode, the
G.729.1 decoder supports G.729 Annex B. Therefore Annex B can be G.729.1 decoder supports G.729 Annex B. Therefore Annex B can be
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