[SIPForum-discussion] Where the CODEC G729A or G729B is define

[Andrea Frontini]

Hi

The attribute annexb=yes in the sdp means that you want to use g729b

a=fmtp:18 annexb=yes

you should send annexb=no to use g729a

If the attribute is omitted the answerer should use g729b by the default but
some vendors use g729a



2008/9/26 Zuñiga, Guillermo <Guillermo.Zuniga at cwpanama.com>

>  Hi Fellows.
>
>
> One question I am trying to send send a Call to a specified Carrier and he
> is telling me that I am sending the INVITE with codec g729b
>
> And he are expecting to receive just g729a, and he can't send me his codec
> using 183/200OK SDP.
>
> Seeing into the INVITE where is define that I am sending g279b and not
> g729a,
>
>
>
> INVITE sip:29725723244195 at 208.65.92.32:5060;user=phone SIP/2.0
>
> ...
>
> ...
>
> v=0
>
> o=MG4000|2.0 182208 182208 IN IP4 172.18.75.2
>
> s=-
>
> c=IN IP4 204.2.240.194
>
> t=0 0
>
> m=audio 56952 RTP/AVP 18 98 101 13
>
> a=rtpmap:98 G.729a/8000
>
> a=rtpmap:101 telephone-event/8000
>
> a=fmtp:101 0-15
>
> a=fmtp:18 annexb=yes
>
> a=ptime:10
>
> a=rtpmap:13 CN/8000
>
>
>
> This line(a=rtpmap:98 G.729a/8000) doesn't mean that I am sending G729A?
> or is the line {m=audio 56952 RTP/AVP 18 98 101 13} and a=fmtp:18
> annexb=yes (b), that means the codec out is (g729b)?
>
>
>
> Guillermo
>
>
>
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