Internet-based voice service - also known as Voice over IP (VoIP) - has the same or many more features than a traditional telephone system (a private branch exchange: PBX using a time division multiplexing signal:TDM), but can be tailored very flexibly to fit your business. The difference between IP-PBX and TDM is that the latter uses physical switches to route calls, whereas IP-PBX uses Internet protocol, the same way all other Internet traffic is routed.
Let HCS leverage your Internet connection to provide traditional telephone service. Your business can scale from an individual line to multiple lines at numerous locations, and you can easily administer your phone network with web-based management tools.