[jitsi-users] error massage with voicecall


Hello, (:

My problem with Jitsi is the following, everytime my Gf and me try to make a voice- or videocall, we get the following error message.
"Error: Could not establish connection (ICE failed)"

Some information, we both made a new XMPP account on Jit.si, in the programm.
the server is in both programms jit.si.
We both got WIN XP, service pack 3. Java is up to date. Jit.si too.
we already tried to turn of the antivir/firewall prog. but it didnt work