Hi If UAC (party A) adds a new media stream in the Re-INVITE, UAS (party B) can always reject it by setting port to 0. UAC should release any resources reserved for the new stream on getting offer rejection from the UAS.
Further, failure of Re-INVITE does not necessarily cause the call to fail. UAC can revert media changes to the previous state and session can continue with the previously negotiated media parameters. Regards Rohit Aggarwal Aricent -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Neranza Bundova Sent: Thursday, September 18, 2008 4:48 PM To: [email protected] Subject: [Sip-implementors] reject sdp offer with multiple media lines Hi All, I am not sure how a user agent should reject an offer when: UA "A" and UA "B" are in call and they have negotiated an audio session. UA "A" sends re-INVITE request to "B" with SDP that rejects the media by setting the port number to 0. UA "A" adds another media to the SDP offer that "B" understand but can not accept. 1. When UA "A" should release the resource used for the media stream? a. when an sdp answer from "B" is received b. when "A" sends the sdp offer. 2. What B will do in this situation? a. Will send sdp answer with all media ports set to 0? Should B close the dialog b. Will send 488 response i. A will close the dialog ii. A and B will continue the dialog and will use already negotiated media stream _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error,please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. Aricent accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus." _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
