Hello guys. I have X-Lite client on WinXP, which in installed on the Virtual Machine (VM), which in turn is installed under Linux host on the public host nf034.jinr.ru (IP 159.93.29.34). For sharing single network card between Linux host and Windows guest systems, VM uses the NAT technology. At first I run SER on Linux at nf034.jinr.ru:5060 and point them as a proxy for X-Lite in its configuration menu. I successfully logged X-Lite to the SER proxy server, and then looked at the X-Lite diagnostic (URI to which X-Lite is assigned is sip:test@nf034.jinr.ru): ====================== -- cut -- ====================== X-Lite release 1103m build stamp 14262 License key: 334EB1FDABF14B00BD22E1C2442210A4 Established SIP protocol listen on: 172.16.218.128:5060 Discovered Port Restricted Single Mapped Port Symmetric NAT Firewall SIP: 172.16.218.128:5060 RTP: 172.16.218.128:8000 NAT: 159.93.29.34 Discovering external SIP port on symmetric firewall... PROXY#0: 159.93.29.34:5060 SEND TIME: 29675015 SEND >> 159.93.29.34:5060 REGISTER sip:nf034.jinr.ru SIP/2.0 Via: SIP/2.0/UDP 159.93.29.34:5060;rport;branch=z9hG4bK2E70AA83DC6248CF85502BCD5E251FC7 From: Test User <sip:test@nf034.jinr.ru>;tag=1898047871 To: Test User <sip:test@nf034.jinr.ru> Contact: "Test User" <sip:test@159.93.29.34:5060> Call-ID: 3DE2CFB300024F7085AEB4169AF1E048(a)nf034.jinr.ru CSeq: 48982 REGISTER Expires: 1800 Max-Forwards: 70 User-Agent: X-Lite release 1103m Content-Length: 0 ====================== -- cut -- ====================== So, glance at the Contact field gives that X-Lite maps 172.16.218.128:5060 to the public IP 159.93.29.34 but with the *same* port 5060! The same we can see at the SER 'location' table in mysql/ser table: +----------+----------------------------+ | username | contact | +----------+----------------------------+ | test | sip:test@159.93.29.34:5060 | +----------+----------------------------+ But, I have SER running exactly at the 159.93.29.34:5060 that leads to the ports conflict. How can I resolve this situation? Thank you! -- Best regards, Timur V. Elzhov COO Warelex LLC