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

[Herve Jourdain]

Hi,

 

What you negotiate is codec G.729a, with annex B enabled by “a=fmtp:18
annexb=yes”.

Annex B deals with Silence Compression (VAD/CNG).

 

Regards,

 

Herve

 

  _____  

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Zuñiga, Guillermo
Sent: vendredi 26 septembre 2008 01:06
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Where the CODEC G729A or G729B is define

 

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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