[SIPForum-discussion] Offer Answer Model

[Raghul Prasanna]

HI Cesar,
 
I did some investigation myself and here is the snippet from RFC 3264 - Offer Answer model for SDP

 
 For each "m=" line in the offer, there MUST be a corresponding "m="
   line in the answer.  The answer MUST contain exactly the same number
   of "m=" lines as the offer.  This allows for streams to be matched up
   based on their order.  This implies that if the offer contained zero
   "m=" lines, the answer MUST contain zero "m=" lines.

 
This seems to be contradicting what you have just said, or I am I getting it wrong?
 
Raghul


--- On Thu, 19/5/11, Cesar Fiestas <fiestas.cesar at gmail.com> wrote:


From: Cesar Fiestas <fiestas.cesar at gmail.com>
Subject: Re: [SIPForum-discussion] Offer Answer Model
To: "Raghul Prasanna" <raghul82 at yahoo.co.uk>
Date: Thursday, 19 May, 2011, 18:03


Well when A send a request to B....is sending a request with a preference codec of g711alaw....B then says yeah cool..but you know what i can also do g729 if you want on top of G711alaw...but A since it can only handle g711alaw .....B says ok G711alaw it is...although I want you know that i can do g729 as well. :)  hope that helps


On Thu, May 19, 2011 at 3:40 AM, Raghul Prasanna <raghul82 at yahoo.co.uk> wrote:





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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