Hello Gaurav, YES - basically when you call SIP server without being registered you can still hear IVR messages like invalid or something else. I do not hear any sound. i also tried to register and still same no sound. You can register and then call also: $ pjsua-x86_64-unknown-linux-gnu --id=sip:1 at 192.168.1.12--registrar=sip:192.168.1.12 --realm="*" --username=1 --password=admin2013 You can also tell which capture device and which playback device to use: $ pjsua-x86_64-unknown-linux-gnu --id=sip:1 at 192.168.1.12--registrar=sip:192.168.1.12 --realm="*" --username=1 --password=admin2013 --capture-dev=5 --playback-dev=0 But what-ever is given i tried and i do not have audio output and audio capture working. Why nobody knows anything about this issue???? i have tried version 0.9 till 2.1 all have same issue with me. Any advise fix for this plz. Thank you Reg -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20131204/79134beb/attachment-0001.html>