vidgui - it's an example of PJSIP usage. You should first build PJSP lib and after that - use build lib in vidgui. for UI vidgui uses QT SDK. in vidgui shown how you can use pjsip stack to operate calls. about your question: *"What i want to achieve is that it will automatically mute my music?"* you should change CALL SETTINGS. see couple posts before your question: http://comments.gmane.org/gmane.comp.voip.pjsip/15037 I had already answered with code. so: 1. you should use code of change call settings in you application then you make or receive call. OR 2. you should change PJSUA code - to mute audio. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120131/16c9e621/attachment.html>