By migrating to APS for symbian_sound.c low level driver this will be automatically fixed. With Audio Proxy Server the Audio priorities it's automatically managed by Symbian . Regards Fabio Pietrosanti Benny Prijono wrote: > I'm afraid the description is still too vague to be useful. For > general audio troubleshooting ideas, please see > http://trac.pjsip.org/repos/wiki/sound-problems. Before trying on the > device, I would suggest to use pjsua to try out your configuration first. > > Cheers > Benny