i am using freeswitch for a VOIP application. after loading mod_portaudio, pa devlist results blank , pa call 9999 and pa call 9996 reasult mod_portaudio.c:2453 Error invalid output audio device. . Can anyone please help me why these errors are coming. Thanks in advance.
Try to install alsa dev package, then reconfigure and recompile freeswitch.
In ubuntu package name is libasound2-dev.
Some more info here: http://portaudio.com/docs/v19-doxydocs/compile_linux.html