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A vertical service code (VSC) is a sequence of digits and the signals star (*) and number sign (#) dialed on a telephone keypad or rotary dial to enable or disable certain telephony service features.[1] Some vertical service codes require dialing of a telephone number after the code sequence. On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes. On rotary dial telephones, the star is replaced by dialing 11.

In North Americantelephony, VSCs were developed by AT&T Corp. as Custom Local Area Signaling Services (CLASS or LASS) codes in the 1960s and 70s. Their use became ubiquitous throughout the 1990s and eventually became a recognized standard. 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 local telephone subscriber, going up (vertically) inside the local central office instead of out (horizontally) to another telephone company.

Feature definitions[edit]

North America[edit]

The following are the vertical service codes generally recommended by the North American Numbering Plan Administration for use in the NANP territories. Popular wars yt music. Not all of these services are available in all areas, and some are only available to landline or cellular telephones.

Local Area Signalling Services (LASS) and Custom Calling Feature Control Codes:[2][1][3]

Vertical service codeService definition
Tone
dialing
Pulse
dialing
*511151Who called me. Provides the directory number, date and time of unanswered calls
*521152Call Hold (Single Line Variety Package). Permits the call to be picked up at another station.
*531153Distinctive Ring B. Allows a subscriber to alert a specific party distinctively.
*541154Distinctive Ring C. Allows a subscriber to alert a specific party distinctively.
*571157Call trace
*601160Call blocking
*611161Priority call
*621162Selective call waiting
*631163Selective call forwarding
*651165Calling number delivery activation
*661166Continuous redial
*671167Calling number delivery blocking
*681168Activate call forwarding on busy
*691169Last-call return (incoming)
*701170Call waiting disable
*711171Usage sensitive three-way call
*721172Unconditional forward: All calls
*731173Call forward: Cancel
*741174Speed calling (8 numbers)
*751175Speed calling (30 numbers)
*771177Anonymous call rejection activation
*781178Do not disturb
*791179Do not disturb disable
*801180Call blocking disable
*811181Priority call disable
*821182Caller ID (per call)
*831183Selective call forwarding disable
*851185Caller ID disable
*861186Continuous redial cancel
*871187Anonymous call rejection deactivation
*881188Deactivate call forwarding on busy
*891189Last-call return cancel
*901190Conditional forward: Busy line
*921192Conditional forward: No answer
*941194Directed call pickup
*272Wireless Priority Service

See also[edit]

  • Pat Fleet – Prompt voice for most U.S. AT&T implementations of VSC features

References[edit]

  1. ^ ab'Vertical Service Codes – Code Definitions'. NANPA.com. Neustar. Retrieved 2013-03-18.
  2. ^voyager (1995-04-15). Erik Bloodaxe (ed.). 'The #hack FAQ'. Phrack Magazine. p. 7. Retrieved 2013-03-18.
  3. ^'Vertical Service Codes – Code Assignments'. NANPA.com. Neustar. Retrieved 2013-03-18.

Age of chivalry gfx. This article incorporates public domain material from the General Services Administration document: 'Federal Standard 1037C'.

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