I am trying to write a outbound proxy server and trying to get some test going first. But I cant get the X-Lite to receive my response. I tried Via header?and then?origination IP and port to send back the response but no luck. The x-lite?log does not show any response received from my server end. But I can receive the request from X-Lite from the same UDP bindining. This is the request I get from X-Lite REGISTER sip:192.168.1.101 SIP/2.0 Via: SIP/2.0/UDP 127.0.0.1:13000;branch=z9hG4bK-d8754z-6e6a4d3eb433e127-1---d8754z-;rport Max-Forwards: 70 Contact: <sip:test at 127.0.0.1:13000;rinstance=134f3af566a4e24e> To: "test1"<sip:test at 192.168.1.101> From: "test1"<sip:test at 192.168.1.101>;tag=8837f779 Call-ID: MTgxNDVjZmRlNWZhNzZjYjkyMjMyZTZiYmJlNWE4OTU. CSeq: 1 REGISTER Expires: 3600 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO User-Agent: X-Lite release 1100l stamp 47546 Content-Length: 0 The response i send to 127.0.0.1:13000. I m using same machine for X-lite and server so 127.0.0.1 should be fine. But I tried with real IP as well. SIP/2.0 407 Proxy Authentication Required CSeq: 1 REGISTER Via: SIP/2.0/UDP 127.0.0.1:13000;branch=z9hG4bK-d8754z-6e6a4d3eb433e127-1---d8754z-;rport From: "test1"<sip:test at 192.168.1.101>;tag=tag=8837f779 Call-ID: MTgxNDVjZmRlNWZhNzZjYjkyMjMyZTZiYmJlNWE4OTU. To: "test1"<sip:test at 192.168.1.101>;tag=130353091825 Proxy(-Authenticate) : DIGEST(realm = "my proxy", nonce = "123694880513180607203532510510") Content-Length: 0 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090313/d4928b7c/attachment.html>