Dear Greger Thanks for replying. My SER is at public IP. I am attaching the ser.cfg and the ngrep output. All ngrep logs is the REGISTER messages and their replies. Today, I was testing with Twinkle softphone. It successfully registered (see the ngrep.txt). But when I call any extension, I don't see any output from ngrep. Is the client not sending any request or is it being blocked? But who is blocking it on the SER side? There is no NAT there. And NAT on clientside should not block outgoing traffic. I am lost here. Thanks Harmeet Date: Fri, 31 Aug 2007 12:49:57 +0200 From: greger(a)teigre.com To: harmeet(a)hotmail.com CC: serusers(a)lists.iptel.org Subject: Re: [Serusers] Can't make a single call. Help me please. So, your SER has a public IP address, right? Your ser.cfg + a SIP call trace (text, please) would be good. g-) Harmeet Singh wrote: Hi all After spending whole week reading and googling I am writing here. Hope someone from here can help me. Here is my setup - I have a Fedora 7 desktop with SER, mysql, and rtpproxy running. This is connected directly to the cable modem. There is not NAT in between. Firewall and SELinux are disabled. I have X-Lite client on my Laptop connected to a Wi-Fi router on a different IP. This router has NAT but the firewall is disabled in the router. On the far end, my sister has X-Lite on her desktop which is also behind NAT. Both X-Lite clients can REGISTER and the SIP server sends 200 OK. But can't make calls. When all clients and SER are on the same network with local IP addresses, I can make calls between the X-Lite clients and SJPhone on different computers. No problem. And Grandstream phones also work in the local setup. Any help is appreciated. HS _______________________________________________ Serusers mailing list Serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers