Hi Marco. I'm using pjsip on Ubuntu 9.04 and CentOS 5.3(Red Hat distr.) I haven't any problems there. All system audio settings are default, so i think the problem is in your code. May be you forgot to use a sleep(pj_sleep) in your media_thread or in other thread you're using when call happens? Cheers -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20091021/53f1fefd/attachment.html>