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  2. IP PBX - Wikipedia

    en.wikipedia.org/wiki/IP_PBX

    An IP PBX is a PBX system with IP connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP protocol stack. Voice over IP (VoIP) gateways can be combined with traditional PBX functionality to allow businesses to use their managed intranet to help reduce long distance expenses and take ...

  3. Telephone switchboard - Wikipedia

    en.wikipedia.org/wiki/Telephone_switchboard

    PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.

  4. Business telephone system - Wikipedia

    en.wikipedia.org/wiki/Business_telephone_system

    This means the customer does not need to buy or install PBX equipment. Generally, the service is provided by a lease agreement and the provider can, in some configurations, use the same switching equipment to service multiple hosted PBX customers. The first hosted PBX services were feature-rich compared to most premises-based systems of the ...

  5. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    A PBX serves an organization's telephones and any private leased line circuits, typically situated in large office spaces or organizational campuses. Smaller setups might use a PBX or key telephone system managed by a receptionist, catering to the telecommunication needs of the enterprise.

  6. Switchboard operator - Wikipedia

    en.wikipedia.org/wiki/Switchboard_operator

    Lines from the central office were usually arranged along the bottom row. Before the advent of operator distance dialing and customer direct dial (DDD) calling, a switchboard operator would work with their counterparts in distant central office to complete long-distance calls. Switchboard operators are typically required to have very strong ...

  7. Session Initiation Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Initiation_Protocol

    The service provides routing of telephone calls from a client's private branch exchange (PBX) telephone system to the PSTN. Such services may simplify corporate information system infrastructure by sharing Internet access for voice and data, and removing the cost for Basic Rate Interface (BRI) or Primary Rate Interface (PRI) telephone circuits.

  8. Ground start - Wikipedia

    en.wikipedia.org/wiki/Ground_start

    Normal single-line telephones and key systems typically work on loop-start lines. On loop-start lines the PBX and central office may inadvertently seize the line simultaneously, a condition called glare, resulting in call collision since neither gets the expected response and no call can be initiated.

  9. Automatic call distributor - Wikipedia

    en.wikipedia.org/wiki/Automatic_call_distributor

    A Private Branch Exchange (PBX) is a telephone exchange device that acts as a switchboard to route phone calls within an organisation. This technology developed into Automated Call Distribution systems using computer technology to automatically connect incoming calls to recipients based on programmable logic.