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keywords: ip pbx voip gateway gsm gateway
I wanted to make louder the voice of the operator on the mobile side (so that the client who calls from his mobile phone would hear the operator voice better) and changed the ADC gain according to the guide. No change. Then I tried to alter the DAC gain (it was -20db, I changed to -10db) and I got what I wanted to achieve.
If you want to adjust the volume on SIP phone side, pls change DAC gain; If your mobile side, change ADC gain.