No...the 200 OK for the INVITE should not carry any new offer, since the answer for the offer in the INVITE is already done. If the 200 OK- INVITE contains some SDP that should be same as the answer SDP that was sent in the reliable provisional response (answer1).
Thanks, Arnab On Tue, Jan 20, 2009 at 1:00 PM, Subbu Rajendran <[email protected]>wrote: > Hi All, > Following is example call flow from RFC 3311 (SIP UPDATE Method). Is SDP a > must in the 200 OK for INVITE in this case? If it is required, then 200 OK > should contain 'answer 3'. Is this a legal behavior as answer in 200 OK for > INVITE ('answer 3') is not based on the offer in the INVITE ('offer 1'). > > Could anyone please explain or point me to the RFC that explains this case? > > Caller Callee > > (1) INVITE with offer 1 > |---------------------------->| > > (2) 180 with answer 1 > |<----------------------------| > > (3) PRACK > |---------------------------->| > > (4) 200 PRACK > |<----------------------------| > > (5) UPDATE with offer 2 > |---------------------------->| > > (6) 200 UPDATE with answer 2 > |<----------------------------| > > (7) UPDATE with offer 3 > |<----------------------------| > > (8) 200 UPDATE with answer 3 > |---------------------------->| > > (9) 200 INVITE (SDP ?) > |<----------------------------| > > (10) ACK > |---------------------------->| > > > Thanks & Regards, > Subbu > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
