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  2. Extension (telephone) - Wikipedia

    en.wikipedia.org/wiki/Extension_(telephone)

    In business telephony, a telephone extension may refer to a phone on an internal telephone line attached to a private branch exchange (PBX) or Centrex system. The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a ...

  3. Business telephone system - Wikipedia

    en.wikipedia.org/wiki/Business_telephone_system

    Early-1970s Telephone Exchange model TESLA Automatic system Early model 464G Western Electric key telephone set. A business telephone system is a telephone system typically used in business environments, encompassing the range of technology from the key telephone system (KTS) to the private branch exchange (PBX).

  4. AT&T Merlin - Wikipedia

    en.wikipedia.org/wiki/AT&T_Merlin

    Merlin Plus was expandable to up to eight lines and up to 20 phone extensions. For larger installations, AT&T System 25 PBX was an advanced digital switching system that integrates voice and data communications. It was designed to meet the business communications needs of customers in the 30 to 150 station range.

  5. Off-premises extension - Wikipedia

    en.wikipedia.org/wiki/Off-premises_extension

    An off-premises extension (OPX), sometimes also known as off-premises station (OPS), is an extension telephone at a location distant from its servicing exchange.. One type of off-premises extension, connected to a private branch exchange (PBX), is generally used to provide employees with access to a company telephone system while they are out of the office.

  6. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. [1] Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing.

  7. IP PBX - Wikipedia

    en.wikipedia.org/wiki/IP_PBX

    An IP PBX ("Internet Protocol private branch exchange") is a system that connects telephone extensions to the public switched telephone network (PSTN) and provides internal communication for a business.

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