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{{use American English|date=September 2022}}
{{use MDY dates|date=September 2022}}
A '''vertical service code''' ('''VSC''') is a sequence of digits and the signals [[Asterisk|star]] ({{Key press|*}}) and [[Number sign|pound/hash]] ({{Key press|#}}) dialed on a [[telephone keypad]] or [[rotary dial]] to access certain telephone service features.<ref name="NANPA">{{Cite web |title=Vertical Service Codes – Code Definitions |url=https://nationalnanpa.com/number_resource_info/vsc_definitions.html |publisher=North American Numbering Plan Administrator |website=NationalNANPA.com |access-date=2022-07-30 }}</ref> 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 [[Asterisk#Telephony|star key]], resulting in the commonly used name ''star codes''. On rotary dial telephones, the star is replaced by dialing ''11''.
In [[North American]] [[telephony]], VSCs were developed by the [[American Telephone and Telegraph Company]] (AT&T) 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 telephone subscriber, going up (''vertically'') inside the local [[telephone exchange|central office]] instead of out (''horizontally'') to another telephone company.
==Feature definitions==
The following are the vertical service codes generally recommended by the [[North American Numbering Plan Administrator]] for use in the NANP territories. Not all of these services are available in all areas, and some are only available on [[landline]] telephones or [[Mobile phone]]s.
Local Area Signalling Services (LASS) and Custom Calling Feature Control Codes:<ref name="
{| class="wikitable sortable"
|-
! colspan="2" | Vertical service code
|-
! Tone<br>dialing
! Pulse<br>dialing |-
| align="center" | *51
| align="center" | 1151
| ''Who called me''. Provides the directory number, date and time of unanswered calls.
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *52
| align="center" | 1152
| Call Hold (Single Line Variety Package). Permits the call to be picked up at another station.
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *53
| align="center" | 1153
| Distinctive Ring B. Allows a subscriber to alert a specific party distinctively.
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *54
| align="center" | 1154
| Distinctive Ring C. Allows a subscriber to alert a specific party distinctively.
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *57
| align="center" | 1157
| [[Call trace]] (Malicious caller identification)
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *60
| align="center" | 1160
| [[Call blocking]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *61
| align="center" | 1161
| [[Priority call]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *62
| align="center" | 1162
| Selective call waiting
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *63
| align="center" | 1163
| Selective [[call forwarding]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *65
| align="center" | 1165
| [[Caller ID|Calling number]] delivery activation
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *66
| align="center" | 1166
| [[Continuous redial]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *67
Line 75 ⟶ 110:
| align="center" | 1168
| Activate call forwarding on busy
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *69
Line 86 ⟶ 124:
| align="center" | 1170
| [[Call waiting]] disable
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *71
| align="center" | 1171
| Usage sensitive three-way call
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *72
| align="center" | 1172
| [[Call forwarding|Unconditional forward: All calls]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *73
| align="center" | 1173
| [[Call forwarding|Call forward: Cancel]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *74
| align="center" | 1174
| [[Speed calling]] (8 numbers)
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *75
| align="center" | 1175
| [[Speed calling]] (30 numbers)
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *77
| align="center" | 1177
| [[Anonymous call rejection]] activation
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *78
| align="center" | 1178
| Do not disturb
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *79
| align="center" | 1179
| Do not disturb disable
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *80
| align="center" | 1180
| [[Call blocking|Call blocking disable]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *81
| align="center" | 1181
| [[Priority call]] disable
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *82
Line 138 ⟶ 208:
| align="center" | 1183
| Selective call forwarding disable
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *85
| align="center" | 1185
| [[Caller ID|Caller ID disable]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *86
| align="center" | 1186
| [[Continuous redial|Continuous redial cancel]]
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *87
| align="center" | 1187
| [[Anonymous call rejection]] deactivation
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *88
| align="center" | 1188
| Deactivate call forwarding on busy
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *89
| align="center" | 1189
| [[Last-call return]] cancel
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *90
| align="center" | 1190
| Conditional forward: Busy line
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *92
| align="center" | 1192
| Conditional forward: No answer
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *94
| align="center" | 1194
| Directed call pickup
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *272
| align="center" |
| [[Nationwide Wireless Priority Service|Wireless Priority Service]]
| align="center" |
| align="center" |
| align="center" |
|}
== See also ==
{{Portal|Telephones}}
* {{Annotated link|Mobile dial code}}
* [[Pat Fleet]] – Prompt voice for most U.S. [[AT&T Corp.|AT&T]] implementations of VSC features
*
*
==References==
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