I can think a case where REGISTER request has "Contact: *" and "Expires: 0" i.e. unregistering for all contacts might not have any Contact header in 200 OK.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ansuman Mukherjee Sent: Wednesday, August 29, 2007 9:53 AM To: [email protected] Subject: [Sip-implementors] Contact header missing in 200-OK sent by SIPServer Hello All, I'm facing an unique issue with a specific SIP Server in here. The issue is - the' Contact' header is always missing in the 200-OK message sent in reply to the initial REGISTER message. However when I try with X-Lite with this Server, it works properly even if the contact header is missing in the 200-OK. As per my understanding of RFC3261 Section 10.3, it is mandatory for the Server to send a contact info in the 200-OK response to the REGISTER request. But what I'm failing to understand is what happens if there is no contact header present in the 200-OK message? How is a SIP UA expected to behave in such scenario? Is there any mandate to address such a scenario - or is it left onto the SIP client vendor to implement there own customisation? Awaiting your valuable response. Thanks, Ansuman _________________________________________________________________ Download the latest version of Windows Live Messenger NOW! http://get.live.com/en-ie/messenger/overview _______________________________________________ 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
