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  2. AT&T Merlin - Wikipedia

    en.wikipedia.org/wiki/AT&T_Merlin

    The Merlin system was originally sold in two-line, six-telephone (206); four-line, 10-telephone (410); and eight-line, 20-telephone (820) configurations. Later, there was a further 10-line, 30-telephone configuration, and with the addition of an expansion key service unit (KSU) the system could accommodate up to 30 lines and 70 telephones ...

  3. 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.

  4. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  5. 10 Phone Systems for Small Businesses - AOL

    www.aol.com/10-phone-systems-small-businesses...

    Start by comparing VoIP phone service providers. Ready to upgrade your business communications? Start by comparing VoIP phone service providers. ... Home & Garden. Lighter Side. Medicare. News ...

  6. Managed facilities-based voice network - Wikipedia

    en.wikipedia.org/wiki/Managed_facilities-based...

    According to NFPA 72 2010, 3.3.141, [1] an MFVN is defined simply as: A physical facilities-based network capable of transmitting real time signals with formats unchanged that is managed, operated, and maintained by the service provider to ensure service quality and reliability from the subscriber location to public switched telephone network (PSTN) interconnection points or other MFVN peer ...

  7. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    PARTNER ACS (Advanced Communications System), Replaced by IP Office 500 Partner Mode/Edition; PARTNER Small Office Edition; S8700 & S8720; S8500; S8300 a, b & c; SPIRIT; System 25 (Previously made by AT&T) System 75 (Previously made by AT&T) System 75 XE (Previously made by AT&T) System 85 (Previously made by AT&T) IP Office 400 (SOE, 403, 406 ...

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    at&t merlin telephone systemat&t merlin phone system history
    list of mobile phone service providers