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 <[EMAIL PROTECTED]> 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 _______________________________________________ discussion mailing list [EMAIL PROTECTED] http://sipforum.org/mailman/listinfo/discussion ----------------------------------------- SIMPLICITY IS THE BEAUTY. BE NATURAL LIVE NATURAL. ----------------------------------------- Somesh S. Shanbhag Focus Area - VoIP Team (FA-VoIP) Mascon Global Communication Technologies Enterprise of Mascon Global Limited #59/2, 100Ft Ring Road Banashankari II stage Bangalore-560070 Karnataka INDIA Website: http://www.mgl.com/ ----------------------------------------- --------------------------------- Do you Yahoo!? Get on board. You're invited to try the new Yahoo! Mail Beta. _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
