[SIPForum-discussion] Gateway disconnects while using G729

Andrea Puddu androjoker at hotmail.com
Thu May 8 13:46:48 UTC 2008

As per RFC 
3264 :
« The interpretation of 
fmtp parameters in an offer depends on the
   parameters.  In many 
cases, those parameters describe specific
   configurations of 
the media format, and should therefore be processed
   as the media format 
value itself would be.  This means that the same
   fmtp parameters with 
the same values MUST be present in the answer if
   the media format 
they describe is present in the answer.  Other fmtp
   parameters are more 
like parameters, for which it is perfectly
   acceptable for each 
agent to use different values.  In that case, the
   answer MAY contain 
fmtp parameters, and those MAY have the same
   values as those in 
the offer, or they MAY be different. »


To: discussion at sipforum.org
From: ganeshk.r at tcs.com
Date: Thu, 8 May 2008 18:43:01 +0530
Subject: [SIPForum-discussion] Gateway disconnects while using G729


A VoIP phone sends invite with sdp G729
with annexb=no

My useragent responds with 200 OK with

But gateway disconnects the call on
seeing my response with annexb=yes.

Can anyone tell me what is the RFC for
SDP offer/answer for G.729 or any other source regarding this.


Ganeshkumar R

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