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PBX (Private Branch Exchange) is the foundation of the business telephony system. It switches calls between VoIP (Voice over Internet Protocol or IP) users on local lines while allowing all users to share a certain number of external phone lines. The typical IP PBX can also switch calls between a VoIP user and a traditional telephone user, or between two traditional telephone users in the same way that a conventional PBX does. IP-PBX systems provide PBX functionality such as call holding, conference calling, and auto attendant over IP-based networks instead of traditional circuit-switched networks. From a technology perspective, an IP PBX is a telephone switch that supports VoIP by converting IP phone calls into TDM connections for the PSTN.
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