[Users] Problems registering NAT clients

Hello, First of all, I'm spanish and my english isn't good, so please excuse my mistakes. I've been working with openser for a year. Now I'm modifying my SIP service in order to allow clients in NAT scenarios. I've read about symmetric / full cone / ... and other NAT scenarios. I've read about mediaproxy / rtpproxy and nathelper modules. I've got a openser.cfg working properly without NAT clients. And I've modified it (see attach). Client X-Lite: IP: 192.168.1.2 (public address 81.39.220.5) Listen SIP port: 5060 Listen RTP port: 8000 Server: Openser 1.0 with Media Proxy IP: 147.83.197.39 Config in opernser.cfg If i try to register with a UAC (X-Lite or K-Phone) with symmetric NAT scenario. Opernser server doesn't answer the client to 5060 port, as i need. X-Lite Diagnostic LOG is client_messages.txt Client timed out without receiving any server messages. This is a tcpdump on clients side: 17:42:23.458980 IP 192.168.1.2.5060 > 147.83.197.39.5060: SIP, length: 448 17:42:23.558019 IP 147.83.197.39.5060 > 192.168.1.2.10145: SIP, length: 538 17:42:23.558077 IP 192.168.1.2 > 147.83.197.39: ICMP 192.168.1.2 udp port 10145 unreachable, length 556 17:42:25.085485 IP 192.168.1.2.5060 > 147.83.197.39.5060: SIP, length: 448 17:42:28.108960 IP 192.168.1.2.5060 > 147.83.197.39.5060: SIP, length: 448 17:42:32.643903 IP 192.168.1.2.5060 > 147.83.197.39.5060: SIP, length: 2 17:42:34.156151 IP 192.168.1.2.5060 > 147.83.197.39.5060: SIP, length: 448 On the server this is the tcpdump: 17:42:23.904035 IP 81.39.220.5.10145 > 147.83.197.39.5060: SIP, length: 448 17:42:23.904261 IP 147.83.197.39.5060 > 81.39.220.5.10145: SIP, length: 538 17:42:23.905028 IP 147.83.197.39.5060 > 81.39.220.5.10145: SIP, length: 680 17:42:24.004623 IP 81.39.220.5 > 147.83.197.39: ICMP 81.39.220.5 udp port 10145 unreachable, length 556 17:42:25.525470 IP 81.39.220.5.10145 > 147.83.197.39.5060: SIP, length: 448 17:42:25.525607 IP 147.83.197.39.5060 > 81.39.220.5.10145: SIP, length: 538 17:42:25.526314 IP 147.83.197.39.5060 > 81.39.220.5.10145: SIP, length: 680 17:42:28.549322 IP 81.39.220.5.10145 > 147.83.197.39.5060: SIP, length: 448 What's wrong? It's necessary to use a STUN server? Why can't register? Why openser doesn't reply to 5060 port? My client it's only reachable in this. Can anyone help me? Anyone have a OpenSer config working? Thanks in advance -- ------------------------------------- Aquel que planta árboles bajo los que sabe muy bien que nunca se sentara, ha descubierto el auténtico significado de la vida.