Hi Pedro! I've started exactly from the pjsua application, with the option "--use-ice", and with the STUN servers "stunserver.org" and "stun.ekiga.net". I have also added an "id" like "sip:alice at example.com<sip%3Aalice at example.com>" ... The problem is that I'm not able to prove the ICE connectivity mechanism..... If I try a call or an IM with another peer in the same LAN, no problem: i wrote "sip:10.0.x2.y2" from my host at "10.0.x1.y1" and I get the call or the message to the other peer...But, if I try to call the Mapped Address of the peer, I've a timeout error and no direct connectivity if possible. Then I've tried to call a peer not in my LAN...I can't obtain the message, nor the call. The NAT detection function states that I was behind a Full Cone NAT, and the extern peer was behind a Port Restricted, but no connectivity was possible... Maybe I've to register to some server? I made a wrong configuration of pjsua? Why the ICE checks doesn't seem to start? All I have to do is exactly the implementation of the IM function of pjsua, demonstrating that ICE can holes NATs... Why this doesn't work with you? I hope the effort of studying this code will not be unhelpful... :-((( -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080717/84f3b56b/attachment-0001.html