Hi Jagan, I think UAS behavior is not correct as per SIP RFC. In no case a UAS (US which receive calls) can send a Cancel. It can only send Responses.
Can you provide us the logs (tcpdump) of UDP messages send by UAS and Gateway? Also give us some more description regarding the UAS and Media Gateway device (company, model and version). Probably it might be a bug / issue in UAS SIP stack code. PS: Try the same case with other device and contact vendor of UAS regarding this issue. They might has new version of firmware already. Regards, Vishal Mathur Jabber ID: [EMAIL PROTECTED] Symantec Corporation www.symantec.com _________________________________ Office: +91-20-66067655 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jagan Mohan Sent: Wednesday, November 14, 2007 5:35 PM To: [email protected] Subject: [Sip-implementors] UAS sending a CANCEL Hi All, I have the following call flow: PSTN===Media Gateway-----UAS Call flow is made from PSTN phone to UAS. Media --------------UAS Gateway INVITE--------> <--------100 Trying <--------180 Ringing At this point, can UAS send a CANCEL to the media gateway? From the discussion in various mailing lists, I understand that UAS can not send a CANCEL request in this scenario. It can send a 4xx/6xx But, I could not find any RFC which talks about this. Could any one please provide info. on the RFC which talks about the above scenario? TIA, Jagan _______________________________________________ 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
