Hello, I am using fedora 22 and running pjsua from command line under ==> pjproject-2.4.5/pjsip-apps/bin/pjsua-x86_64-unknown-linux-gnu When I try to place a call I found following : 10:51:50.782 pjsua_aud.c .Set sound device: capture=-1, playback=-2 10:51:50.782 pjsua_aud.c ..Error retrieving default audio device parameters: Unable to find default audio device (PJMEDIA_EAUD_NODEFDEV) [status=420006] I have installed portaudio19-dev libportaudio2 pulseaudio alsa-utils liboss4-salsa-dev alsa-base alsa-tools libasound2-plugins libasound2 libasound2-dev binutils binutils-dev libasound-dev pulseaudio-dev. I also tried ==> pjproject-2.4.5/pjsip-apps/bin/pjsua-x86_64-unknown-linux-gnu --capture-dev=-1 --playback-dev=-1 but didn't work. And yes my speaker is working well. If anyone can solve it please reply here : karishma.barot@panamaxil.com -- (Regards) Karishma P. Barot GET-C Panamax Infotech Ltd