Internet Protocol-Private Branch Exchange

A PBX (Private Branch Exchange) is a system that connects telephone extensions to the Public Switched Telephone Network and provides internal communication for a business. An IP-PBX may also provide CTI features (Computer Telephone Integration). An IP-PBX can exist as a physical hardware device or in software. An-IP PBX is a PBX with Internet Protocol connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP protocol stack.

VoIP (Voice over IP) gateways can be combined with traditional PBX functionality to allow businesses to use their managed intranet to help reduce long distance expenses and take advantage of the benefits of a single network for voice and data (converged network).