You have to enable the rtpproxy in your configuration:

if (uri=~"^sip:[8].*@") { force_rtp_proxy(); t_relay_to_udp("209.7.34.58","7060"); break; }

a complete configuration with nat traversal can be found on: http://lists.iptel.org/pipermail/serusers/2004-February/005996.html

klaus

mawali@news.icns.com wrote:

Hi

I posted the below message a couple of days ago. I want all numbers starting with 8 to go to a SIP PSTN gateway. The problem is that neither forward() nor relay_to_udp() work through NAT. I want to be able to use rtpproxy (or mediaProxy for that matter) for such connections. I see that forward() and relay_to_udp() both bypass the nathelper rtpproxy. Anyone knows the best way to ensure rtpproxy involvement in this scenario. If rtpproxy is not involved, I cannot use the PSTN gateway from NAT'd endpoints. There is gotta be a way.

                            /-------------------\
                            | SER (port 5060) + |
  SIP UA <----- NAT ------> |      rtpproxy     |
                            |                   |
                            |   SIP_PSTNGW      |---->PSTN
                            | (* at port 7060)  |
                            \___________________/

Previous post:

Hi

I am trying to send all my calls to a PSTN gateway (asterisk with digium cards running on the same machine on 7060). I can use forward, but then I cannot use the solution SER provides me by using NAT helper. Consider the forwarding script: Â Â Â Â Â Â if (uri=~"^sip:[8].*@") { forward(209.7.34.58,7060); Â Â Â Â }

Here it works fine if I am calling from a public IP, but will not work if I am calling from a NATed client since this stateless forwarding will take SER out of the picture, and rtpproxy will not be used. I have also tried using t_relay_to_udp, but is is doing the same, the below lines are still not making SER to proxy the request.

            if (uri=~"^sip:[8].*@")
            {
                 t_relay_to_udp("209.7.34.58","7060");
                  break;
            }

What would be the best way of doing it. I want SER to act as a proxy (B2BUA?) between my caller and the PSTN asterisk server. I want to be able to use nathelper for this scenario.

Regards

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