The following is the result after running "sndinfo" % 04:34:05.522 os_core_unix.c pjlib 0.5.10.4 for POSIX initialized 04:34:05.568 pasound.c PortAudio sound library initialized, status=0 04:34:05.569 pasound.c PortAudio host api count=1 04:34:05.569 pasound.c Sound device count=1 04:34:05.580 pjlib select() I/O Queue created (0x44e04) Device #00: Name : /dev/dsp0 # of input channels : 0 # of output channels: 16 Default clock rate : 44100 Hz % The default clock rate is 44100, but where it will fail while initial sound device with 44100..?? something wrong with the pjsua_media ?? thanks