I don't wether this is available or been discussed but what I would find really usefull is a voicemail greeting selector that would allow you to record different greetings for different situations, personal, business etc. Record and then title the message which then becomes selectable from a menu. Ideally linked to a button or shortcut of some kind. For example if I am out of the office I redirect all calls to my mobile, if I am unavailable my personal greeting is used via my network provider. Not very professional and to change this every time would be impracticle.