Switching Voice mail ON/OFF from a telephone using a "Feature Code"?

Hi there,

Does anyone know if voice mail can be switched - ON/OFF from a telephone using a “Feature Code” ? The only other way I see of disabling voice mail is in the FreePBX extension GUI, but I would like the user to do this.

Unless I am being very silly, I can’t see how this can be done.

Regards to all - Colin