Low volume level on Softphone

Building a Gsm gateway. Using usb modem, FreePBX & Zoiper as softphone. So, the setup is working. But, the issue is that the other person can hear my voice loudly. But, I can barely hear them. Their voice in my softphone is very low. There other post on the forum about how to increase the volume in extensions.conf or may be extensions_override_freepbx.conf. I am confused how to add the TX/RX values and in which .conf file should I use.

For me this is working:

;; receiving call
exten => yourexten,n,Set(VOLUME(TX)=10)
;; calling 
exten => yourexten,n,Set(VOLUME(RX)=10)


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