Hi, I would like to know if PJMedia (RTP) can pass through NAT using STUN. I managed to create a STUN client for windows mobile based on another API, signaling is ok (I call Stun client before sending every SIP request and call it before sending RTP to include the IP and public port number from stun server in the SDP) but I cannot seem to have RTP (no voice) what could be the problem? given that I am P/Invoking the RTP wrapper class in .NET. if the problem in my STUN client(which I suppose is working fine since signaling is ok) how can I use STUN in pjnath (I would appreciate an example code). Thanks for you help Anass Kartit