Hi Xi Tang, When the preconditions are Mandatory and are not met by the answer: 580 should be send. When the preconditions are optional and are not met by the answer: 200 will be send.
580 will have the SDP. with all the SDP payload as but for this a=des:qos mandatory local sendrecv It should be: a=des:qos failure local sendrecv (failure should be added) and port number in M should be set 0 for the a which is not met. HTH, Sreeram. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tang Xi Sent: Tuesday, October 17, 2006 8:20 AM To: [email protected] Subject: [Sip-implementors] Query:How can UA ignore a precondition offer? Hi, 1>in the first INVITE, UAC contain a SDP with precondition information like this: Surpported:100rel, precondition ... m=audio 777 RTP/AVP 1 2 3 a=curr:qos local none a=curr:qos remote none a=des:qos mandatory local sendrecv a=des:qos none remote sendrecv ... 2>UAS receive the request,and UAS is able to send or receive the media stream with all of the codec, but it does not support the precondition, how can it ignore the precondition information? Should it do like this? Unsupported:precondition ... m=audio 777 RTP/AVP 1 2 3 a=rtpmap: .... a=rtpmap: .... a=rtpmap: .... a=sendrecv Would appreciate your response. Thanks Xi Tang _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors 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 proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
