Hi, I am using an older version of PJSIP (1.0.1) with which I was facing problems using TCP with OpenSIPS 1.6 as the server. I found this -> http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/2009-August/008501.html which led to to test out the pjsua client (PJSUA v1.8.10-trunk/win32) but same problem. Now the problem, using TCP with PJSIP the register goes out from port X but contact contains port Y. Registration suceeds but the client doesn't receive any request as the contact port in the registration is different. Here's a trace of the REGISTER request/response. Transmission Control Protocol, Src Port: 1276 (1276), Dst Port: 5506 (5506), Seq: 652, Ack: 490, Len: 851 Session Initiation Protocol Request-Line: REGISTER sip:192.168.3.14:5506;transport=tcp SIP/2.0 Message Header Via: SIP/2.0/TCP 192.168.3.21:1276;rport;branch=z9hG4bKPjc09d30513e73438fbd42bd51bfee60af Max-Forwards: 70 From: <sip:admin@192.168.3.14>;tag=4304c5e32a434217bcd4d67a94f135a4 To: <sip:admin at 192.168.3.14> Call-ID: f5cb3910974343ff8066e3cf2b55a833 CSeq: 15015 REGISTER User-Agent: PJSUA v1.8.10-trunk/win32 Supported: outbound, path Contact: <sip:admin at 192.168.3.21:5060;transport=TCP;ob>;reg-id=1;+sip.instance="<urn:uuid:00000000-0000-0000-0000-0000e6ab0100>" Expires: 300 Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS Authorization: Digest username="admin", realm="192.168.3.14", nonce="4d00c6d30dcb2b946f4c5a1cc17f3329afb991f5", uri="sip:192.168.3.14:5506;transport=tcp", response="0022fd9bb0e26472dfbba99bb712db33" Content-Length: 0 Transmission Control Protocol, Src Port: 5506 (5506), Dst Port: 1276 (1276), Seq: 490, Ack: 1503, Len: 451 Session Initiation Protocol Status-Line: SIP/2.0 200 OK Message Header Via: SIP/2.0/TCP 192.168.3.21:1276;rport=1276;branch=z9hG4bKPjc09d30513e73438fbd42bd51bfee60af From: <sip:admin@192.168.3.14>;tag=4304c5e32a434217bcd4d67a94f135a4 To: <sip:admin at 192.168.3.14>;tag=963a4f451b19d91042195990b9b42283.8b61 Call-ID: f5cb3910974343ff8066e3cf2b55a833 CSeq: 15015 REGISTER Contact: <sip:admin at 192.168.3.21:5060;transport=TCP;ob>;expires=300 Server: OpenSIPS (1.6.0-tls (i386/linux)) Content-Length: 0 Now, OpenSIPS is unable to route the request to the contact when the client is behind a NAT. Is there a way to make the port on 'Contact' same as the source port? That way OpenSIPS would route the request over the already established TCP connection. Regards, Anshuman -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20101209/f8289584/attachment.html>