Voicemail with multiple boxes and forwarding

[chiarscuro]

I've looked around quite a bit and have been surprised to have a hard time finding a simple unified communications system. Most offer too many features at too expensive of a price

Here's what I'm looking for:

One phone number.
Multiple options (press 1, press 2 etc) that will ring to phone numbers that you can input.

Would be nice if you could change the numbers it routes to via iPhone interface.

Going to be used for a large event where I don't want to get calls for things that someone else is responsible for. Any ideas?