Hi all, can anyone tell me, how to add ring tone at incoming call....... i am using playfile.c for playing ring tone in my project(i am taking reference from pjsua 200line), it is giving me break point at pj_mutex_lock in os_core_win32.c line no. 903......... Regards New_bie -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090103/f2a441d8/attachment.html>