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RoEdAl / asterisk-chan-quectel

Asterisk channel driver for Quectel and SimCOM modules
GNU General Public License v2.0
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Audio Quality Very Bad (SIM7600G-H) #18

Closed blitz9826 closed 3 months ago

blitz9826 commented 5 months ago

I've set the following commands:

AT+COUTGAIN=0 AT+CMICGAIN=0 AT+CECM=0

The audio quality is still poor for transmission. Receiving is fine. It sounds like the mic has gain applied to it, and the sound is muffled and blown out. I'd love to try setting the in-call-only variables somehow through a script that I can hook into Asterisk for each call made. Using FreePBX 17 Beta on Debian 12.

Thanks!

RoEdAl commented 5 months ago

From my experience setting all gains to zero is a very bad idea. A good starting point is described on Wiki page:

AT+COUTGAIN=8
AT+CMICGAIN=3

then you may gradually change gain values. Every small change requires testing. And there are more AT commands to experiment with: AT+CRXVOL, AT+CTXVOL, AT+CTXMICGAIN etc.

It is also a good idea to turn off audio processing on SIP Phone you're using during testing. In particular, turn off AGC (automatic gain control) if possible.