[Montevecchi] Hi Olle If you have multiple interfaces can you bind an instance of PJSUA to a specific interface? [Montevecchi] Yes you can, as you can read at the pjsua application help page (http://www.pjsip.org/pjsua.htm) In my case I have a LAN conenction and a 3G modem connection and I want to bind one PJSUA to the LAN interface and another to the 3G modem. [Montevecchi] You can specify directly the IP address of the interface using the --ip-addr option, i.e.: --ip-addr=10.18.1.53 Bye Massimiliano