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  2. History of AT&T - Wikipedia

    en.wikipedia.org/wiki/History_of_AT&T

    History of AT&T. The history of AT&T dates back to the invention of the telephone. The Bell Telephone Company was established in 1877 by Alexander Graham Bell, who obtained the first US patent for the telephone, and his father-in-law, Gardiner Greene Hubbard. Bell and Hubbard also established American Telephone and Telegraph Company in 1885 ...

  3. AT&T Internet - Wikipedia

    en.wikipedia.org/wiki/AT&T_Internet

    Website. www .att .com /internet /. AT&T Internet is an AT&T brand of broadband internet service. Previously, AT&T Internet was branded as U-verse Internet and bundled with U-verse TV, which was spun off into the newly independent DirecTV in 2021. AT&T Internet plans powered by fiber-optic cable use the AT&T Fiber brand.

  4. Ameritech - Wikipedia

    en.wikipedia.org/wiki/Ameritech

    AADS was a Tier 1 network Internet Exchange Point in Chicago, Illinois that provided service to higher education and research networks via a program called Star TAP [1] and commercial networks. [2] After the merger with SBC, AADS did business as the SBC Network Access Point or SBC/AADS NAP. Ameritech logo, 1984–1993 Ameritech's final logo ...

  5. AT&T - Wikipedia

    en.wikipedia.org/wiki/AT&T

    AT&T Inc. AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. [ 4] It is the world's third-largest telecommunications company by revenue and the second-largest wireless carrier in the United States behind Verizon but ahead of T-Mobile. [ 5]

  6. Ameritech Cellular - Wikipedia

    en.wikipedia.org/wiki/Ameritech_Cellular

    Ameritech Mobile Communications, LLC was the first company in the United States to provide cellular mobile phone service to the general public. Cell service became publicly available in Chicago on October 13, 1983. The company was a division of Ameritech which, as of January 1, 1984, was the holding company of Illinois Bell, Michigan Bell ...

  7. Public switched telephone network - Wikipedia

    en.wikipedia.org/wiki/Public_switched_telephone...

    The public switched telephone network ( PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony. The PSTN consists of telephone lines, fiber-optic cables, microwave transmission links, cellular networks ...

  8. Session border controller - Wikipedia

    en.wikipedia.org/wiki/Session_border_controller

    A session border controller ( SBC) is a network element deployed to protect SIP based voice over Internet Protocol (VoIP) networks. Early deployments of SBCs were focused on the borders between two service provider networks in a peering environment. This role has now expanded to include significant deployments between a service provider's ...

  9. SBC Long Distance - Wikipedia

    en.wikipedia.org/wiki/SBC_Long_Distance

    SBC Long Distance LLC [1] [2] is a long-distance telephone company owned by AT&T that does business as AT&T Long Distance. SBC Long Distance competes with other long-distance providers who provide service within some of the Bell Operating Company service boundaries of AT&T. SBC Long Distance is a separate subsidiary than AT&T Communications ...

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