[Asterisk-Dev] silencesupp header in SDP

[Moises Silva]

hu???

hehe good question. This may help you out:

http://bugs.digium.com/view.php?id=5374

I have few time reading and making small modifications in Asterisk
code. RTP is a still obscure part for me, i guess I understand the big
picture, but not the underlying complexity (yet). So i guess both just
start sending, but if nothing comes, then does not send any more
frames.

Makes sense?

On 1/17/06, Steve Langstaff <steve.langstaff at citel.com> wrote:
> If Asterisk uses incoming voice frames as a timer to send it's own voice frames,
> does this preclude asterisk servers ever sending audio to each other? Who would start? :)
>
> -----Original Message-----
> From: asterisk-dev-bounces at lists.digium.com
> [mailto:asterisk-dev-bounces at lists.digium.com]On Behalf Of Moises Silva
> Sent: 17 January 2006 14:51
> To: Asterisk Developers Mailing List
> Subject: Re: [Asterisk-Dev] silencesupp header in SDP
>
>
> Youre right, chan_sip.c is the right place. But AFAIK Asterisk does
> not support silence suppression. If you remove that asterisk may stop
> sending sound, because it seems it uses  the incoming voice frames
> (including silence frames) as timer to send its own sound frames.
> Plase correct me if im wrong.
>
> Regards
>
> On 1/17/06, Atif Rasheed <atif at iphonica.com> wrote:
> > Sorry, its not silencesupp attribute, its Annex-B indication which was
> > not in 1.0.9 and now its there in 1.2.1 and probably here parsing is
> > failing.
> >
> > Media Attribute ( a ): fmtp:18 annexb=no
> >                  Media Attribute Fieldname: fmtp
> >                  Media Attribute Value: 18 annexb=no
> >
> >
> > Shoud I remove it from chan_sip.c, i.e. I just remove this block
> >  if (codec == AST_FORMAT_G729A)
> >                 /* Indicate that we don't support VAD (G.729 annex B) */
> >                 ast_build_string(a_buf, a_size, "a=fmtp:%d
> > annexb=no\r\n", rtp_code);
> >
> > and Annex-B indication will not be there in outgoing SDP messages ???
> >
> > Thank you
> >
> > Atif
> >
> > Atif Rasheed wrote:
> >
> > > hello all,
> > >
> > > How can I strip this header from outgoing SDP messages
> > >
> > > Media Attribute (a): silenceSupp:off - - - -
> > >                Media Attribute Fieldname: silenceSupp
> > >                Media Attribute Value: off - - - -
> > >
> > > probably it was not there in 1.0.9, but when I upgraded to 1.2.1 its
> > > creating problems for some GW's .
> > >
> > > Thank you
> > >
> > > Atif
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