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

Cullen,

As per Sec 2.1.9 RFC 4856, "annexb=no" has to be sent by Answerer in case
the answerer does not support G729 AnnexB. The exact RFC snippet is 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."

Please let me know whether you wish to explicitly mention in the draft that
Answerer *MUST* send "annexb=no".

Thanks
Partha

> -----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/
> >
> > _______________________________________________
> > I-D-Announce mailing list
> > I-D-Announce@ietf.org
> > https://www.ietf.org/mailman/listinfo/i-d-announce
> > Internet-Draft directories: http://www.ietf.org/shadow.html
> > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> 
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