You don't have to spend thousands on a telephone system. CallButler is a complete Skype based small business telephone system that can be setup in just 10 minutes. It has support for PBX, voicemail, auto-attendant, IVR, and music on hold. With CallButler you can implement telephony features that businesses 10X your size use, but at price that you can afford.
||Windows 2000/XP/Vista, Skype