Hi, > How do we disable AEC? Is it an option in the settings somewhere. What > does AEC stand for?? > Though you wrote later that you disabled AEC I'll just recheck ... in pjsua-api disabling would be something like: pjsua_set_ec (0,PJMEDIA_ECHO_SPEEX); Other than that - try to make a complete wireshark recording of call, then check the audio packets that you're sending out, whether they contain proper sound. Grrets