Hello Daniel, Thank you for the reply. I'm quite new to the sip world, and not sure how to change the config file. The pstn part of the config file is as follows: #!ifdef WITH_PSTN if (strempty($sel(cfg_get.pstn.gw_ip))) { xlog("SCRIPT: PSTN routing enabled but pstn.gw_ip not defined\n"); return; } if(!($rU=~"^(\+|00)[1-9][0-9]{3,20}$")) return; if(from_uri!=myself && src_ip!=104.199.152.250) { sl_send_reply("403", "Not Allowed haha"); exit; } if (strempty($sel(cfg_get.pstn.gw_port))) { $ru = "sip:" + $rU + "@" + $sel(cfg_get.pstn.gw_ip); } else { $ru = "sip:" + $rU + "@" + $sel(cfg_get.pstn.gw_ip) + ":" + $sel(cfg_get.pstn.gw_port); } route(RELAY); exit; #!endif Can you help me do the modification? Thank you. Cheers, Jesse At 2017-06-06 15:36:22, "Daniel-Constantin Mierla" <miconda(a)gmail.com> wrote: Hello, if you set r-uri to a UDP address, then you can just use t_relay(), and everything needed should be done by kamailio. Be sure you do record_route()/loose_route(), so the requests within dialog are also routed properly. Cheers, Daniel On 06.06.17 08:50, 赵国杰 wrote: Hi everyone, I have a kamailio server with TLS enabled. I need to forword UAC request to a PSTN gateway which only support UDP. Is it possible that kamailio can translate this with proper configuration? How can i do this? many thanks Jesse -- Daniel-Constantin Mierla www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - www.asipto.com Kamailio World Conference - www.kamailioworld.com

Hello, is the protocol scheme 'sips'? Because if the scheme is 'sip', the lack of transport parameter implies use of UDP. Cheers, Daniel On 06.06.17 10:48, 赵国杰 wrote: -- Daniel-Constantin Mierla www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - www.asipto.com Kamailio World Conference - www.kamailioworld.com