Increase receiving volume of single extension


I have a voicemail with extension 90.
Here I would like to increase the receiving volume.
(For internal and external calls, but ONLY for this extension).

I had tried it via the ‘extensions_custom.conf’ as it was done in the following topic:

But I can’t get it to work, the volume stays the same.
Can someone help me here? What exactly do I have to do?
Sorry is don’t know me so well in the topic Asterisk/FreePBX.

Thanks a lot!


after the unsuccessful experiments with the volume increase of the extension, I have now been able to solve my problem differently:

By setting the VM option ‘volgain=10’ the volume of the voicemail is also increased when sending mail. This is exactly what I needed and it works as desired.

Many greetings

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