Ability to Record Voicemail Greetings for Departments, not just Users
Most people will understand voicemail greetings as something recorded by using their phone. Personalized and simple.
A User or a Department's voicemail greeting is prone to frequent change for holidays or schedule changes.
Having to upload an mp3 for every holiday/schedule is time consuming compared to simply dialing *97 and the department voicemail box to record a new greeting. This can already be done with user voicemail boxes.