[SIPForum-discussion] Offer Answer Model

[Raghul Prasanna]

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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