Hi All, when incoming call static void ring_start(pjsua_call_id call_id) and then i call AudioServicesPlayAlertSound(AudioToolbox Framework)it cause the device mic not working.. on the caller cant hear anything..this happen on pjsip 2.0 but not 1.8.10..and i realize it wont happen if my ring_id is equal to kSystemSoundID_Vibrate and also when i comment out //AudioServicesPlayAlertSound(ring_id) then it work.. Thanks, -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120301/ec66e181/attachment.html>