Hello, On 9/25/2003 11:43 AM, manu v wrote: you need to copy&paste pieces of configuration from pstn.cfg to your ser.cfg Shortly, if you want to forward all the requests having the username part of URI starting with an optional '+' followed by one or many digits to your PSTN gateway located at 192.168.0.10:5060 you need these piece of configuration after your sanity checks. if (uri=~"sip:\+?[0-9]+@.*") { rewritehostport("192.168.0.10:5060"); # forward the request now if (!t_relay()) { sl_reply_error(); }; break; }; The pstn.cfg.file is a more complete and complex example, showing how to authenticate and authorize calls for PSTN. Best regards, Daniel