[SIPForum-discussion] Offer in a 200OK for Invite transaction.

[Somesh S Shanbhag]

Hi Manpreet,
  
  RFC 3261 section 13.2.1 has the following clause ...
  
  "
  
If the initial offer is in an INVITE, the answer MUST be in a
reliable non-failure message from UAS back to UAC which is
correlated to that INVITE.  For this specification, that is
only the final 2xx response to that INVITE.  That same exact
answer MAY also be placed in any provisional responses sent
prior to the answer.  The UAC MUST treat the first session
description it receives as the answer, and MUST ignore any
session descriptions in subsequent responses to the initial 
INVITE
"

So, UAC MUST treat 183 session progress as the answer and
shall ignore in subsequent responses to INVITE.

Hope this helps
Thanks
Somesh S. Shanbhag

  

Manpreet Singh <msingh at ibasis.net> wrote:              For the INVITE   transaction where the offer was sent in an INVITE and the answer coming back in   183, would it be valid to send a new offer in the 200OK? So the question is   whether the 200OK can be used to send a "new" Offer ( different from the answer   in 183 ) for the INVITE transaction once 183 has completed the offer/answer   part of that transaction. Only UPDATE can be used for early dialog changes as   per my understanding and a 200OK still constitutes early dialog so it wont   be valid to send a new offer in 200OK? Although 200OK can carry the same SDP as   183 which would mean nothing or would not be considered as early dialog change   in capability.
   
  Please correct me if   I am wrong.
   
  Thanks
   
  Manpreet   
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Somesh S. Shanbhag
Focus Area - VoIP Team (FA-VoIP)
Mascon Global Communication Technologies
Enterprise of Mascon Global Limited
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