Vertical service code

calling featureservice featureCLASStelephone feature code*98calling featuresCLASS codecodeCustom Calling Servicesfeature
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.wikipedia
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Telephone number

phone numbertelephone numbersphone numbers
Some vertical service codes require dialing of a telephone number after the code sequence.
Telephone numbers are often dialed in conjunction with other signaling code sequences, such as vertical service codes, to invoke special telephone service features.

Telephone keypad

keypad12-key telephone keypaddial pad
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.
These keys were added to provide signals for anticipated data entry purposes in business applications, but found use in Custom Calling Services (CLASS) features installed in electronic switching systems.

Malicious caller identification

Malicious caller identification, activated by Vertical service code Star codes *57, is an upcharge fee subscription service offered by telephone company providers which, when dialed immediately after a malicious call, records meta-data for police follow-up.

Asterisk

*asterisksstar
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. On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes.
They are used to navigate menus in Touch-Tone systems such as Voice mail, or in Vertical service codes.

Dual-tone multi-frequency signaling

DTMFtouch-tonetouch tone
On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes.
This led to the addition of the number sign octothorpe asterisk or "star" keys as well as a group of keys for menu selection: A, B, C and D. In the end, the lettered keys were dropped from most phones, and it was many years before the two symbol keys became widely used for vertical service codes such as *67 in the United States of America and Canada to suppress caller ID.

Caller ID

caller line identificationCLIcall display
Most service providers however, allow the caller to block caller ID presentation through the vertical service code *67.

North American Numbering Plan

Area codeArea codesArea code(s)
As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration.
There are also special codes, such as:

Continuous redial

Continuous redial, busy number redial, or repeat dial, is a vertical service code (calling feature) that allows callers to automatically redial a busy telephone number until a connection is made.

Call forwarding

forwardingCall divertCall Forward on Busy
In North America, the NANP generally uses the following vertical service codes to control call forwarding:

Call waiting

call-waiting
In North America, the NANP uses the *70 star code prefix to suspend call waiting for a dialed call.

Last-call return

*691471call return
The general public tends to refer to the service by the telephone feature code, the telephone number it has in their country; for example, in North America this is *69, while in the UK it is called 1471.

Priority call

Priority call, and priority ring are also brand names of calling features which give a distinctive ring to calls from telephone numbers chosen by the subscriber and which require a subscription from their local telephone company.

Anonymous call rejection

Anonymous Call BlockerAnonymous Call Rejection (*77)
In North American NANP telephone system, anonymous call rejection (ACR) is a landline calling feature that screens out calls from callers who have blocked their caller ID information.

*82

Caller ID (per call)
This Vertical Service Code, *82, enables calling line identification regardless of subscriber preference, dialed to unblock withheld numbers (private callers) in the U.S. on a per-call basis.

Speed calling

Speed calling service allows telephone subscribers to assign one or two digit speed calling codes, by dialing a change speed calling list access code, a feature code, and a new telephone number.

Pat Fleet

Pat Fleet – Prompt voice for most U.S. AT&T implementations of VSC features
She is also the voice for most "star" services (e.g. last-call return, call blocking, etc.) for AT&T local telephone companies, and the voice heard when making AT&T handled calls through 1-800-CALL-ATT (225-5288) and through international AT&T access numbers such as USADirect.

Short code

Common Short Codeshortcodefive-digit and six-digit numbers, shorter than a telephone number
Short code
*Vertical service code

Number sign

#hashhash symbol
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.

Rotary dial

dialrotary telephonerotary phone
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.

North America

NorthNAAmerica
In North American telephony, VSCs were developed by AT&T Corp. as Custom Local Area Signaling Services (CLASS or LASS) codes in the 1960s and 70s.

Telephony

digital telephonytelephonedigital
In North American telephony, VSCs were developed by AT&T Corp. as Custom Local Area Signaling Services (CLASS or LASS) codes in the 1960s and 70s.

AT&T Corporation

AT&TAmerican Telephone & Telegraph CompanyAmerican Telephone and Telegraph Company
Pat Fleet – Prompt voice for most U.S. AT&T implementations of VSC features In North American telephony, VSCs were developed by AT&T Corp. as Custom Local Area Signaling Services (CLASS or LASS) codes in the 1960s and 70s.

Telephone exchange

exchangescentral officeexchange
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.

Landline

fixed linefixed-lineland line
Not all of these services are available in all areas, and some are only available to landline or cellular telephones.

Mobile phone

cell phonemobilemobile phones
Not all of these services are available in all areas, and some are only available to landline or cellular telephones.