[pjsip] DTMF and Null Device

[Archie Rosenblum]

I have a small server app that listens and sends DTMF digits.  The null
device [pjsua_set_null_snd_dev()] is very handy for this application since
the machine is not equipped with a sound card.  When I send DTMF digits
using pjsua_call_dial_dtmf() I do not hear the DTMF digit on the receiving
side.  I have tested this on other machines with a sound card and it seems
that if there is a regular sound device, the DTMF digit is heard, but after
a call to pjsua_set_null_snd_dev() nothing is heard.  Is there a way to send
DTMF when using the null sound device?

 

Best regards,

Archie

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