How about Morse Code sounds for an incoming message? Or "Allllaaaarrrm!" for, well, your morning alarm?
I only advise the latter if you're sleeping alone. The wife took severe umbrage at such a rude awakening. It worked a treat for me, though. I've never left the house so quickly.
I'm thinking of adding whispered orders for 'Silent mode' incoming call and "Contact!" for a Bluetooth or Infrared connection.