Increase volume on internal calls

Hi everyone,
I’m experiencing a low volume on internal calls using Freepbx, both on dect phones and ip phones. Is there a way to increase the gain of the volume of the internal calls or all the calls in general? Thank you for your help!

The Asterisk VOLUME function exposes this but you’d probably need to route calls through custom dial plan in extensions_custom.conf file in order to use it on every call. (Maybe start with a test in that file to see how it sounds.)

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