On my main extension I keep getting the phone system contacting that user tell them that the voicemail system is 80% full. I've gone through all extensions in use to make sure no one has any saved messages etc and its all clear. However when I run a back up of the data there seems to be a lot of call data there and I don't know where to clear it.

I've gone through the KVM programming guide on my PC (and the app for that matter) and don't see anywhere to manage the messages themselves.

Does anyone know how to clear these voicemails without initializing the system?

Thanks in advance!