Hi Ansuman, If we go by RFC the 200 OK for REGISTER should contain all the contacts that are present for this AOR. A response with no contact header would mean that the user is not registered with any contact headers. I am not sure what you mean by "works properly". I can understand that a call from this X-Lite would be OK because it starts the call. However, can you call this X-lite from any other phone via the server?
regards Rayees -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ansuman Mukherjee Sent: Wednesday, August 29, 2007 2:53 PM 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 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ ---------------------------------------------------------------------------------- IMPORTANT The information contained in this e-mail any attachments is intended only for the named recipient and may be privileged or confidential. If you are not the intended recipient, please notify us immediately on +44 (0)1908 425000 and do not disclose, copy, distribute or take any action based on the contents of this e-mail. You should understand and accept that, when communicating with us by e-mail, it is not a totally secure communication medium. We accept no liability for any direct, indirect or consequential loss arising from any action taken in reliance on the information contained in this e-mail and give no warranty or representation as to its accuracy or reliability. DIGITALK has the facility to monitor and read both incoming and outgoing communications by e-mail. In line with industry efforts to reduce the proliferation of Un-Solicited SPAM messages, DIGITALK uses various methods including Reverse-DNS lookups and ban-lists to prevent malicious content reaching our users. This message and any attachments has been scanned for known viruses. However, we would advise you to ensure the content is indeed virus free. We do not, to the extent permitted by law, accept any liability (whether in contract, negligence or otherwise) for any virus infection and/or external compromise of security and/or breach of confidentiality in relation to transmissions sent by e-mail. VAT No: GB 876 3287 81. Reg No: 3080801 Place of Registration: England Registered Office Address: 2 Radian Court, Knowlhill, Milton Keynes ----------------------------------------------------------------------------------" _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
