Who converts audio for autoinformer to Asterisk?

Question

linux

Hey!
I'm learning Asterisk.
If you do asterisk> file convert xxx.wav xxx.ulaw
that, the asterisk swears at the file if it is not mono, and if it doesn’t suit something else.
Maybe some module has already been invented so that he can convert WAV of any format to the desired codec?
Probably there is some binding for some audio converter in Linux. But since I have never worked with audio in my life, I would like to ask the experts what they do in this case?

Answer 1

for AA try this in linux console:
sox in.wav -r 8000 -c 1 out.wav
and don't use ulaw, we have alaw standard...

Answer 2

Audacity: