[OpenSER-Users] Route calls to PSTN Gateway

Hi All I have successfully setup OpenSer with a mysql backend. I am able to make calls using sip phones between registered users. What I need to do know is routing calls that start with 00 to my PSTN gateway. But first I need to setup OpenSer to route calls to my PSTN ..! I am using OpenSer1.3 and I have checked sipwise.com but honestly I prefer changing my own config file. But from sipwise.com I concluded that I need the config below But are the nathelper and mediaproxy compiled by default or do I have to recompile with special options ? Other than that where do I set the IP of my PSTN gateway ? Any suggestions or help would be welcome thanks. loadmodule "nathelper.so" modparam("nathelper", "natping_interval", 0) modparam("nathelper", "ping_nated_only", 1) modparam("nathelper", "rtpproxy_sock", "unix:/var/run/rtpproxy.sock") modparam("nathelper", "rtpproxy_disable", 1) modparam("nathelper", "rtpproxy_disable_tout", 60) modparam("nathelper", "rtpproxy_tout", 1) modparam("nathelper", "rtpproxy_retr", 5) modparam("nathelper", "sipping_method", "OPTIONS") modparam("nathelper", "received_avp", "$avp(i:801)") loadmodule "sl.so" modparam("sl", "enable_stats", 1) loadmodule "mediaproxy.so" modparam("mediaproxy", "mediaproxy_socket","/var/run/proxydispatcher.sock") modparam("mediaproxy", "sip_asymmetrics","/etc/openser/sip-asymmetric-clients") modparam("mediaproxy", "rtp_asymmetrics","/etc/openser/rtp-asymmetric-clients") modparam("mediaproxy", "natping_interval", 60) loadmodule "uri.so"