Hi, If ADSL router reconnects and changes its external IP address, pjsua-lib won't know about that. It seems not much of a problem for the SIP signalling: it will discover the new IP address on the next registration. But there won't be media flow because pjsua-lib will announce the old IP address. What is the best way to deal with that? Can I call some function by myself to trigger IP address change checking? Will pjsua_detect_nat_type() do that? I'm using pjproject-1.0, STUN server is set.