Problem not transmitting .wav file

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Hi everyone!

I test a scenario where I register with:
./pjsua --id sip:myNumber at myims.com --registrar sip:myims.com --proxy sip:anIP --realm myims.com --username user --password pass

So as long as I am registered, I want to create a call to someone (it is an auto-answer number) and play a .wav file using the command:
./pjsua  --id sip:myNumber at myims.com sip:NumberToCall at myims.com --proxy sip:anIP --play-file=applause.wav

After I take the tcpdump, I see only the RTP flow of the auto-answer, and the 1 sec of silence created by my own device (after that VAD voice detector takes over).
No RTPs with applause going out of my device!

I see these logs if any helpful:

                                pa_dev.c  ..PortAudio sound library initialized, status=0
12:18:35.779       pa_dev.c  ..PortAudio host api count=2
12:18:35.779       pa_dev.c  ..Sound device count=4    ---> I have a dummy sound card, it should be enough!

wav_player.c  .File player 'applause.wav' created: samp.rate=44100, ch=1, bufsize=4KB, filesize=534KB
12:18:35.794    pjsua_aud.c  .Player created, id=0, slot=1


.Set sound device: capture=-1, playback=-2
12:18:35.796    pjsua_app.c  ..Turning sound device ON
12:18:35.797    pjsua_aud.c  ..Opening sound device PCM at 16000/1/20ms
12:18:35.799    ec0xa183290  ...AEC created, clock_rate=16000, channel=1, samples per frame=320, tail length=200 ms, latency=0 ms
12:18:35.800  pjsua_media.c  .Call 0: initializing media..
12:18:35.800  pjsua_media.c  ..RTP socket reachable at 192.168.1.79:4000
12:18:35.800  pjsua_media.c  ..RTCP socket reachable at 192.168.1.79:4001
12:18:35.800  pjsua_media.c  ..Media index 0 selected for audio call 0

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