Dear All I am working with some developers to create a sip client that supports TLS for me. During the beta stage they created the phone and it sent "sips" packets with transport=tls in the packet. The thing is that I used the sethostport and t_relay to send data to my PSTN gateway that works on UDP but in both cases I was not able to make PSTN calls. The developers created a custom openser.cfg that rewrites sips packets to sip and removes the transport=tls from the packets. How efficient is this ? Is this the typical approach to make a TLS call through Openser where the PSTN gateway does not support TLS ? Please have a look at the config file if you can. http://pastebin.com/m20f7d25a Thanks