Created by: Keith Haugen on 20-02-2012 05:40:46 AM 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: TelephoneNumber@IP_address_of_Cisco_gateway 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?
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