Re: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt

"Muthu Arul Mozhi Perumal (mperumal)" <mperumal@cisco.com> Tue, 21 May 2013 20:15 UTC

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From: "Muthu Arul Mozhi Perumal (mperumal)" <mperumal@cisco.com>
To: "Cullen Jennings (fluffy)" <fluffy@cisco.com>, "mmusic@ietf.org WG" <mmusic@ietf.org>
Thread-Topic: I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
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Date: Tue, 21 May 2013 20:15:51 +0000
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Subject: Re: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
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If the answerer supports RFC3551 it is most likely to support RFC3555 that defines the annexb parameter, because RFC3551 has the following:
      Receivers MUST accept comfort noise frames if restriction of their
      use has not been signaled.  The MIME registration for G729 in RFC
      3555 specifies a parameter that MAY be used with MIME or SDP to
      restrict the use of comfort noise frames.

So, the case where the answerer supports RFC3551, but not annexb isn't probably pragmatic, I think. However, a note could probably be added to the draft..

Muthu

|-----Original Message-----
|From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On Behalf Of Cullen Jennings (fluffy)
|Sent: Tuesday, May 21, 2013 8:13 PM
|To: mmusic@ietf.org WG
|Subject: Re: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
|
|
|What happens when an endpoint that understands the anexb attribute sends and offer to an endpoint that
|does not understand or implement the anexb attribute ?
|
|
|
|
|On May 20, 2013, at 10:19 AM, internet-drafts@ietf.org wrote:
|
|>
|> A New Internet-Draft is available from the on-line Internet-Drafts directories.
|> This draft is a work item of the Multiparty Multimedia Session Control Working Group of the IETF.
|>
|> 	Title           : Offer/Answer Considerations for G.723 Annex A and G.729 Annex B
|> 	Author(s)       : Muthu Arul Mozhi Perumal
|>                          Parthasarathi Ravindran
|> 	Filename        : draft-ietf-mmusic-sdp-g723-g729-01.txt
|> 	Pages           : 8
|> 	Date            : 2013-05-20
|>
|> 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.
|>
|>
|> The IETF datatracker status page for this draft is:
|> https://datatracker.ietf.org/doc/draft-ietf-mmusic-sdp-g723-g729
|>
|> There's also a htmlized version available at:
|> http://tools.ietf.org/html/draft-ietf-mmusic-sdp-g723-g729-01
|>
|> A diff from the previous version is available at:
|> http://www.ietf.org/rfcdiff?url2=draft-ietf-mmusic-sdp-g723-g729-01
|>
|>
|> Internet-Drafts are also available by anonymous FTP at:
|> ftp://ftp.ietf.org/internet-drafts/
|>
|> _______________________________________________
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|> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
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