Vertical service code: Difference between revisions

Revision as of 22:03, 15 March 2004

Revision as of 02:22, 19 March 2004

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A '''vertical service code''' or '''VSC''' is a ficticiousspecial [[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 # toinstead beginof *, though this is actually just a verticalshort servicenumber codetypically used for other commercial services (i.e. pizza delivery), and not a VSC for accessing telephone company services.

==List of vertical service codes==
The (notfollowing 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 [[wireline]] telephones (and unavailable toor [[cellular]] callers)telephones. and someSome require additional services be purchased from the [[telephone company]] to use them):.

* *76 - Advanced Call Waiting Deluxe - Allows a subscriber to specify, in advance of incoming calls, the termination treatment on incoming calls that arrive while the subscriber is engaged in another conversation.

Line 11 ⟶ 12:

* *65 Activation, *85 Deactivation - Calling Number Delivery - Provides the subscriber with the directory number (DN) of the calling party during the ringing cycle.

* *67 - Calling Number Delivery Blocking - Allows the subscriber to temporarily change the permanent public/private status indicator of his/her directory number (DN) and thus control its availability to the called party.

* *70 - Cancel Call Waiting - Provides the subscriber the ability to disable the Call Waiting feature for the duration of a telephone call, such as during a short [[data]] [[transmission]] like a [[fax]] or [[modem]] call.

* *40 - Change Forward-To Number for Customer/Programmable Call Forwarding Busy Line - Access Code followed by directory number is used to change the forwarded-to number for Call Forwarding Busy Line (CFBL). The state of CFBL is not changed when this access code is used. This feature will utilize the activation code of *90 and deactivation code *91 with the following exceptions: activation will not require/allow the identification of a forwarded-to directory number and deactivation will not clear the forwarded-to directory number.

* *42- Change Forward-To Number for Customer Programmable Call Forwarding Don't Answer - Access Code followed by directory number is used to change the forwarded-to number for Call Forwarding Don't Answer (CFDA). The state of CFDA is not changed when this access code is used. This feature will utilize the activation code of *92 and deactivation code *93 with the following exceptions: activation will not require/allow the identification of a forwarded-to directory number and deactivation will not clear the forwarded-to directory number.