A PBX is a communications system that manages both voice and data transfer within a building and to outside lines; it can be used to connect hundreds of internal phone lines to a few phone company lines.

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A PBX (Private Branch Exchange) is a telephone system used within a company or organization to manage internal communications, as well as connect to external phone lines. It allows multiple users to make and receive calls on a limited number of outside phone lines, effectively managing and maximizing communication capabilities within a building or organization.

A PBX Is a Communications System That Manages Both Voice