in my environment, i found the root cause:
in mediastreamer2/src/audiofilter/alsa.c, linphone calls 
snd_pcm_hw_params_set_channels() with channel = 1. but my audio card driver 
does not support mono. i've tested with aplay a mono wave file and get no sound 
either.
how to set linphone to use stereo call?

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https://bugs.launchpad.net/bugs/1390004

Title:
  No sound with pulseaudio

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