Currently callers are not required to press a button to leave a voicemail (i.e. press "1" to leave a voicemail) which allows lots of robo messages to be left on our voicemail box.
Is there a way to require callers, once they are already into the extension's unavailable voicemail box, to press "1" in order to leave a message and if they fail to press "1" the system doesn't record a voicemail?