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

"Muthu Arul Mozhi Perumal (mperumal)" <mperumal@cisco.com> Fri, 24 May 2013 04:20 UTC

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From: "Muthu Arul Mozhi Perumal (mperumal)" <mperumal@cisco.com>
To: "Dale R. Worley" <worley@ariadne.com>, Parthasarathi R <partha@parthasarathi.co.in>
Thread-Topic: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
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Date: Fri, 24 May 2013 04:20:18 +0000
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Cc: "Cullen Jennings \(fluffy\)" <fluffy@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
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|Since the annexb attribute is part of the (original) registration of
|audio/g729, any endpoint that implements that media type understands
|the annexb attribute.  If the answer does not include the annexb
|attribute, the answerer knows that it has implied the default
|"annexb=yes".

Thank you for the clarifying text. We'll include it in the next revision of the draft.

Muthu

|-----Original Message-----
|From: Dale R. Worley [mailto:worley@ariadne.com]
|Sent: Friday, May 24, 2013 3:38 AM
|To: Parthasarathi R
|Cc: Cullen Jennings (fluffy); mmusic@ietf.org; Muthu Arul Mozhi Perumal (mperumal)
|Subject: Re: [MMUSIC] I-D Action: draft-ietf-mmusic-sdp-g723-g729-01.txt
|
|> From: "Parthasarathi R" <partha@parthasarathi.co.in>
|>
|> If the answerer supports RFC3551, then the answerer has to support RFC3555
|> for annexb parameter. Annexb value default value is "Yes" in RFC 3555 as per
|> RFC 3551. RFC 4856 obsoletes RFC 3555 without changing "annexb" related
|> requirement. Please let me know any reason that you wish to change AnnexB
|> parameter default value now.
|
|Sorry, my mistake, I didn't realize that "annexb" is not an extension
|of audio/g729, it's defined in the base specification:
|
|RFC 4856 section 2.1.9
|
|   Registration of Media Type audio/G729
|
|   Type name: audio
|   Subtype name: G729
|   Optional parameters:
|	[...]
|        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.
|
|So the answer to Cullen's query is:
|
|> From: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
|>
|> 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 ?
|
|Since the annexb attribute is part of the (original) registration of
|audio/g729, any endpoint that implements that media type understands
|the annexb attribute.  If the answer does not include the annexb
|attribute, the answerer knows that it has implied the default
|"annexb=yes".
|
|Dale