a customer premises business phone system that manages telephones throughout the enterprise and acts as a gateway to both voice and data networks

an evolution of the traditional PBX telephone switch that bridges the gap between packet-switched IP networks and circuit-switched telephone networks

a PBX for IP phones

See Voice over Internet Protocol

Technology that provides a business with voice-over-Internet protocol (VOIP) services. An IPPBX converts analog voice input into digital signals to be sent over the Internet, then converts digital voice input back into analog signals.

(Internet Protocol Private Branch Exchange) - a PBX that has the ability to send a VoIP voice stream over a LAN/WAN circuit.

A Private Branch Exchange (PBX) is an internal telephone system within a company that switches calls between internal lines while allowing all users to share a certain number of external phone lines. The primary role of the PBX is to save the cost of requiring a separate telephone line for each user.

An enterprise-based IP data network device that switches VoIP telephone traffic. Natural MicroSystems