SIP contact header in REGISTER http://developer.cisco.com/c/message_boards/find_thread?p_l_id=&threadId=5176080 2013-05-22T05:09:59Z 2013-05-22T05:09:59Z Keith Haugen http://developer.cisco.com/c/message_boards/find_message?p_l_id=&messageId=5176079 2012-03-06T19:36:32Z 2012-02-20T11:40:46Z

I am trying to set up forwarding of a SIP phone to an external (PSTN) phone number using the SIP REGISTER (rather than the usual 302 Moved Temporarily response) for a rather unconventional application.    Is there a way to register an external phone number as a contact number on the CISCO 29xx series integrated router (IOS 15.1(4)M1)?    I've tried using the #############Tel URI in the Contact Header field of the SIP REGISTER and received a 400 Bad Request - 'Malformed/Missing Contact field".  (I've tried every variation of the number and get the same response.)   I've tried using the SIP URI in the Contact Header field, using the following format:  [url=https://supportforums.cisco.com/mailto:TelephoneNumber@IP_address_of_Cisco_gateway]TelephoneNumber@IP_address_of_Cisco_gateway[/url] and receive 404 Not Found.  In the debug messages, I'll see, "contact address matches own ip address" (but what IP address can I use for an external phone number?).   Any suggestions on the best way to set up a REGISTER for a SIP phone to have the Contact header field containing an external (PSTN) number?

Keith Haugen 2012-02-20T11:40:46Z