Vertical service code: Difference between revisions

Revision as of 19:44, 28 July 2005

Revision as of 19:38, 4 November 2005

Line 1:

A '''vertical service code''' or '''VSC''' is a special [[telephone number]] that usually begins with the '''*''' (star) key on the [[touch tone]] keypad. Most codes are two digits, although those starting with 2 or 3 are now usually three digits. Some [[cellular telephone]] companies also use '''#''' instead of *, though this is actually just a short number typically used for other commercial services (i.e.g. [[pizza delivery]]), and not a VSC for accessing telephone company services. In some cases VSCs can be accessed from [[Pulse dialing|rotary phones]] by dialing '''11''' instead of the *.

Vertical services codes are often colloquially referred to as "CLASS" codes, after the AT&T trademark for the original implementation of these codes, known as "Custom Local Area Signalling Service".