Hi,Its like INVITE may or may not contain SDP or offer, if invite does not contain offer, in 200 OK we will receive offer and Answer to that offer must sent in ACK.Please see RFC 3261, Section 13.2.1The initial offer MUST be in either an INVITE or, if not there, in the first reliable non-failure messagefrom the UAS back to the UAC. In this specification, that is the final 2xx response.If the initial offer is in an INVITE, the answer MUST be in a reliable non-failure message from UASback to UAC which is correlated to that INVITE. For this specification, that is only the final 2xxresponse to that INVITE. That same exact answer MAY also be placed in any provisional responsessent 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. If the initial offer is in the first reliable non-failure message from the UAS back to UAC, the answerMUST be in the a! cknowledgement for that message (in this specification, ACK for a 2xx response).Regards,BhanuOn Thu, 17 May 2007 04:24:21 +0100 (BST) George AK wrote Hi, Is it a must to have offer-answer (SDP based) in an INVITE session? Can I have a INVITE-200-ACK with out an SDP Offer-Answer? rgds, George --------------------------------- Office firewalls, cyber cafes, college labs, don\'t allow you to download CHAT? Here\'s a solution! _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
Regards, Bhanuprasad KS _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
