When shopping for a phone system, you have three choices: a key system, a PBX system, or a hybrid (a cross between a key and a PBX). Key and hybrid systems are suitable for most small businesses, but if you want to use an auto-attendant to route incoming calls, you'll need a hybrid or PBX system.
A phone dealer can help you choose the best system for your business, but you should understand the basics before you invest in costly telecommunication equipment. The following list will help you evaluate your telephone-system options.