Comments inline... Thanks & Regards, Nataraju A.B.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kirill Bolshakov Sent: Wednesday, December 14, 2005 2:37 PM To: [EMAIL PROTECTED] Subject: [Sip-implementors] no SDP in 200 reply to INVITE Hello Everyone, could someone please clarify the following situation: the INVITE is first answered with "183 Session Progress" containing an SDP answer, and the final "200 OK" does not contain any SDP. RFC 3261 reads (sect. 13.3.1.4): =================== If the INVITE request contained an offer, and the UAS had not yet sent an answer, the 2xx MUST contain an answer. If the INVITE did not contain an offer, the 2xx MUST contain an offer if the UAS had not yet sent an offer. =================== So, is 200 OK without SDP valid when SDP answer arrived in "183 Session Progress"? Or is reliability of provisional responses mandatory in this case? [ABN] yes, even though 183 carried SDP but sent unreliably, its mandatory to carry the SAME SDP in 200 OK also.... [ABN] if the 1xx responses were sent RELIABLY then, its mandatory for those reliable provisional responses to carry the answer, else 200 OK must carry the SDP. If the 1xx responses were sent reliably then it's optional to carry the SDP in 200 responses...... But in any case, there could only one offer/answer negotiation open at any point in time... Thanks in advance, Kirill _______________________________________________ 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
