So this extension changes the volume of the phone. So its name should be VolumeChanger. And the parameter should be named simply volume and not audioNumber... and as Kevinkun mentioned, both of your volume extensions should be merged into one.
Okay but i might as well name the extension audiotool if im going to merge or combine these both extension and the new extension called CurrentMaxVolume and name the input to VolumeLevel.
I just created new one with the same thing you said : VolumeChanger.aix (5.3 KB)
But i didn't merge the extension, i will merge these 2 extension and the 1 extension will come out but it will also be merged next week.