Hi, I started two instances of simple-pjsua with different SIP ports and I'm getting errors like: pjsua_call.c Timed-out trying to acquire PJSUA mutex What else do I have to set? And can I somehow let the program choose a free port instead of passing it as a command line parameter? Thanks, Stefan -- Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten Browser-Versionen downloaden: http://www.gmx.net/de/go/browser