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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 (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 service codes are often colloquially referred to as "Star" codes, or as "CLASS" codes after the AT&T trademark for the original implementation of these codes, known as "Custom Local Area Signalling Service".
==List of vertical service codes==
The following are the VSCs generally used in the [[North American Numbering Plan]]. Not all of these services are available in all areas, and some are only available to [[landline]] or [[cellular]] telephones. Some require additional services be purchased from the [[telephone company]] to use them.
*'''*00''' ''English'', '''*01''' ''French'' - '''Inward Voice Activated Services''' (IVAS) enables a subscribing business to provide automated voice activated routing for inbound English or French speaking calls (i.e., separate codes for the same service in each language). IVAS will initially consist of the following services:
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