I have to disagree with the previous post. Buying one of those GE or AT&T of the shelf systems is a complete waste of money. There are many small systems out there that are very affordable and will grow as your business grows. Suppose that in the first 3 months your 4 line system is suddenly maxxed out & everyone is getting a busy signal. Then, after the money spent on the off the shelf system, you have to go out and buy an actual system. There are systems out there that are very affordable such as the Comdial DX-80, Vodavi STS & the Iwatsu Adix.