[SIPForum-techwg] Question about annexb=yes or no

[mike xu]

Hi Maulik,

Ok, I see. Thank you for your explanation!

Best regards,
Mike

On 5/28/08, Maulik Shah (maushah) <maushah at cisco.com> wrote:
> Hi Mike
>   Annexb=no or yes decides which variant of G.729 codec should be used.
>  It does not mean disable silence suppression per my knowledge. G.729
>  Annex B is the default (in absence of annexb value in SDP per RFC3555)
>  which has inbuilt silence suppression (VAD). Annexb=no implies use G.729
>  variant which can have silence suppression enabled or disabled as a
>  separate parameter in the SDP.
>
>  Thanks
>  Maulik
>
>
>
>
>  -----Original Message-----
>  From: techwg-bounces at sipforum.org [mailto:techwg-bounces at sipforum.org]
>  On Behalf Of mike xu
>  Sent: Sunday, May 25, 2008 8:02 PM
>  To: techwg at sipforum.org
>  Subject: [SIPForum-techwg] Question about annexb=yes or no
>
>  Hi all,
>
>  In RFC3555 section 4.1.9, it said "annexb: indicates that Annex B,
>  voice activity detection, is        used or preferred". Could somebody
>  explain this in more details?
>  Take an example, if
>  annexb=no
>  was received, does it mean that I should disable local side's silence
>  suppression (didn't send silence suppression frames)?
>
>  And if I send annexb=no in my INVITE's SDP, it means that my local
>  side's silence suppression was disabled and the callee should not send
>  silence suppression frames to me?
>
>  Thanks in advance,
>  Mike
>
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