wrtc.adv.stunServer is a string property containing URL to STUN server if other than IXNX unit's built-in one is used.
String containing URL to STUN server.
wrtc.wsServer
If you for some reason want to use other STUN server than IXNX unit's built-in one you must set wrtc.adv.stunServer in wrtc.init().