[Serusers] How to force proxy instead of forward?

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