[SIPForum-discussion] Offer Answer Model

[Abinash Sarangi]

Hi Raghul,

 
A having codec preferences as G711 and G729 , behaved correctly while sending initial INVITE which is negotiated with G711 from B..
for reINVITE [hold] when B is sending m as G711 A should respond with G711 instead of G711 and G729..
 
Are both A and B tied up to some SBC or CallAgent or call manager..then may you check with the egress and ingress codec preferences.



Thanks & Regards 
-Abinash 



 


Date: Thu, 19 May 2011 08:40:52 +0100
From: raghul82 at yahoo.co.uk
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Offer Answer Model





Hello All,


I have a scenario where, the Invite message has just one code - G.711 A law, but the 200 OK from the other end has g.711 A law and G.729.


Actually this happens in Reinvite when putting the call onhold.


The A end sent invite with G.711 alaw and G.729 codec which was answered with G.711 A law by B end, call got connected.


Now A end receives Reinvite from B end to put call on hold, with just G.711 A law and the A end sends 200 OK to Reinvite but with G.711 and G.729 (as seen in the initial Invite).


Is this valid, should the answer always contain only the codecs mentioned in Offer (Invite) which is G.711 A law? Please explain.


If someone can paste any rfc snippet showing how it should behave, it will be very helpful.




Thanks,
Raghul
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