Hi Dutta, If there is no SDP in the Re-invite, UAS should construct offer as if it is a new call. Also UAS must make sure SDP matches that of the previous call
Please refer 3261-->14.2 section for more details. Regarding your question: In case2, "200 ok" should have SDP if UAS still want to continue the call :-)) HTH, Sreeram. ________________________________ From: [EMAIL PROTECTED] on behalf of Banibrata Dutta Sent: Tue 8/23/2005 7:59 AM To: 'Banibrata Dutta'; [email protected] Subject: RE: [Sip-implementors] session refresh, but without SDP ? Additional info: NOTE: Here the "UAS" is the refresher. A B ---INVITE(sdp)---> : M1 <--200 OK--------- : M2 ---ACK-----------> : M3 ... <--INVITE()------- : M4 case1: ---200 OK(sdp)---> : M5 case2: ---200 OK--------> : M5' Is the case1 the valid scenario in case of session refresh, i.e. M5 contains same "sdp" as M1 ? or, is the case2 a valid scenarios ? - bdutta -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Banibrata Dutta Sent: Tuesday, August 23, 2005 4:42 PM To: [email protected] Subject: [Sip-implementors] session refresh, but without SDP ? Hi, Does absence of body (SDP) in the re-INVITE used to do session-refresh (in case of Session-Timers), signify that media properties remain unchanged from the previously negotiated ones, or does it mean, no media, i.e. any established RTP sessions are to be torn down, if re-INVITE doesn't contain body ? thanks & regards, bdutta _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors Confidentiality Notice The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain confidential or privileged information. If you are not the intended recipient, please notify the sender at Wipro or [EMAIL PROTECTED] immediately and destroy all copies of this message and any attachments. _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
