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  2. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up ( vertically ) inside the local central office ...

  3. Short code - Wikipedia

    en.wikipedia.org/wiki/Short_code

    Standard, interoperable short codes in the U.S. are five or six digits long, [28] never start with 1, and only work in the U.S. [29] They are leased by the short code program's registry service provider iconectiv, under a deal with the Common Short Code Administration [30] and CTIA. [31]

  4. Abbreviated dialing - Wikipedia

    en.wikipedia.org/wiki/Abbreviated_dialing

    For text messaging, the technical equivalent is a short code; however, these are rented by their private users rather than being universal and for public services. Vertical service codes may also be considered as abbreviated dialing, though these are often prefixed by the special touch-tone characters * and # (or often 11 for pulse dialing ...

  5. Mobile network codes in ITU region 3xx (North America)

    en.wikipedia.org/wiki/Mobile_network_codes_in...

    This list contains the mobile country codes and mobile network codes for networks with country codes between 300 and 399, inclusively – a region that covers North America and the Caribbean. Guam and the Northern Mariana Islands are included in this region as parts of the United States.

  6. List of airline codes - Wikipedia

    en.wikipedia.org/wiki/List_of_airline_codes

    Download QR code; Print/export Download as PDF; Printable version; ... This is a list of all airline codes. The table lists the IATA airline ...

  7. No. 4 Electronic Switching System - Wikipedia

    en.wikipedia.org/wiki/No._4_Electronic_Switching...

    AT&T Long Distance was the primary customer for the switch. Driving development from the customer's perspective was AT&T VP Billy Oliver. [4] Previous tandem switching systems, primarily the No. 4 Crossbar switch, used analog voice signaling. The decision to switch in a digital voice format was controversial at the time, both from a technical ...

  8. Notes on the Network - Wikipedia

    en.wikipedia.org/wiki/Notes_on_the_Network

    In 1955, AT&T published the first extensive edition under the title Notes on Nationwide Dialing, [2] which was updated the following year (1956) under the title Notes on Distance Dialing. [3] Additional editions were issued in 1961, 1968, and 1975. The first use of the title Notes on the Network was for the 1980 edition. [4]

  9. 5ESS Switching System - Wikipedia

    en.wikipedia.org/wiki/5ESS_Switching_System

    The 5ESS Switching System is a Class 5 telephone electronic switching system developed by Western Electric for the American Telephone and Telegraph Company (AT&T) and the Bell System in the United States. It came into service in 1982 and the last unit was produced in 2003.