make call from PC without Audio devices

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Hello!

I'd like to highlight one issue in PJSIP behaviour.
One PC without any audio devices(see init log):
----------------
...
11:26:12.165     wmme_dev.c  ..WMME found no sound devices
11:26:12.166     wmme_dev.c  ..WMME initialized
11:26:12.166          pjlib  ..select() I/O Queue created (007AE21C)
11:26:12.167   conference.c  ..Creating conference bridge with 254 ports
11:26:12.167   Master/sound  ..Using delay buffer with WSOLA.
11:26:12.172    pjsua_vid.c  ..Initializing video subsystem..
11:26:12.194 ffmpeg_codecs.  ...The H263-1998 decoder is using base codec
(H263)
11:26:12.195 ffmpeg_codecs.  ...The XVID codec is using base codec (MP4V)
11:26:12.274    dshow_dev.c  ...Windows found no video input devices
11:26:12.274    dshow_dev.c  ...DShow has 0 devices:
11:26:12.274 colorbar_dev.c  ...Colorbar video src initialized with 1
device(s):
11:26:12.274 colorbar_dev.c  ... 0: Colorbar generator
11:26:12.277      sdl_dev.c  ...SDL 1.3 initialized
...
----------------
tried to make call (call log), but without success:
----------------
11:33:35.994    tsx007E66C4  ..State changed from Trying to Completed,
event=TX_MSG
11:33:35.994   pjsua_call.c  .Making call with acc #0 to
sip:6002 at 192.168.1.99
11:33:35.994  pjsua_media.c  ..Set sound device: capture=-1, playback=-2
11:33:35.994  pjsua_media.c  ...Error retrieving default audio device
parameters: Unable to find default audio device (PJMEDIA_EAUD_NODEFDEV)
[status=420006]
----------------

Question: is it normal behaviour? then PC has video devices, but has not
audio - and can not make any call.
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