Hi! I'm using PJSIP 1.3 too Please, if you don't have this underflow problem on Windows Mobile, please send me your config_site.h, pjmedia config and other sound related config thanks bye, Attila -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090707/51eafb5c/attachment.html>