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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]] (*) and [[number sign|pound/hash]] (#) dialed on a [[telephone keypad]] or [[rotary dial]] to access certain telephone service features.<ref name=":0" /> 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''.▼
 
▲A '''vertical service code''' ('''VSC''') is a sequence of digits and the signals [[asteriskAsterisk|star]] ({{Key press|*}}) and [[numberNumber sign|pound/hash]] ({{Key press|#}}) dialed on a [[telephone keypad]] or [[rotary dial]] to access certain telephone service features.<ref name=":0NANPA">{{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.▼
 
▲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=":0NANPA">{{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><ref>{{Cite magazine |title=The #hackHack FAQ|url=http://www.phrack.com/issues.html?issue=47&id=7 |author=voyager |editor=Erik Bloodaxe |magazine=Phrack Magazine |page=7 |date=1995-04-15 |access-date=2013-03-18 }}</ref><ref>{{Cite web |title=Vertical Service Codes – Code Assignments |url=http://www.nanpa.com/number_resource_info/vsc_assignments.html |publisher=Neustar |work=NANPA.com |access-date=2013-03-18 |archive-date=December 4, 2015 |archive-url=https://web.archive.org/web/20151204212559/http://www.nanpa.com/number_resource_info/vsc_assignments.html |url-status=dead }}</ref>
 
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| ''Who called me''. Provides the directory number, date and time of unanswered calls.
| align="center" |
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| align="center" | 1152
| Call Hold (Single Line Variety Package). Permits the call to be picked up at another station.
| align="center" |
| align="center" |
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Line 37 ⟶ 40:
| align="center" | 1153
| Distinctive Ring B. Allows a subscriber to alert a specific party distinctively.
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Line 43 ⟶ 47:
| align="center" | 1154
| Distinctive Ring C. Allows a subscriber to alert a specific party distinctively.
| align="center" |
| align="center" |
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Line 49 ⟶ 54:
| align="center" | 1157
| [[Call trace]] (Malicious caller identification)
| align="center" |
| align="center" |
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Line 55 ⟶ 61:
| align="center" | 1160
| [[Call blocking]]
| align="center" |
| align="center" |
| align="center" |
Line 61 ⟶ 68:
| align="center" | 1161
| [[Priority call]]
| align="center" |
| align="center" |
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Line 67 ⟶ 75:
| align="center" | 1162
| Selective call waiting
| align="center" |
| align="center" |
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Line 73 ⟶ 82:
| align="center" | 1163
| Selective [[call forwarding]]
| align="center" |
| align="center" |
| align="center" |
Line 79 ⟶ 89:
| align="center" | 1165
| [[Caller ID|Calling number]] delivery activation
| align="center" |
| align="center" |
| align="center" |
Line 85 ⟶ 96:
| align="center" | 1166
| [[Continuous redial]]
| align="center" |
| align="center" |
| align="center" |
Line 98 ⟶ 110:
| align="center" | 1168
| Activate call forwarding on busy
| align="center" |
| align="center" |
| align="center" |
Line 111 ⟶ 124:
| align="center" | 1170
| [[Call waiting]] disable
| align="center" |
| align="center" |
| align="center" |
Line 117 ⟶ 131:
| align="center" | 1171
| Usage sensitive three-way call
| align="center" |
| align="center" |
| align="center" |
Line 123 ⟶ 138:
| align="center" | 1172
| [[Call forwarding|Unconditional forward: All calls]]
| align="center" |
| align="center" |
| align="center" |
Line 129 ⟶ 145:
| align="center" | 1173
| [[Call forwarding|Call forward: Cancel]]
| align="center" |
| align="center" |
| align="center" |
Line 135 ⟶ 152:
| align="center" | 1174
| [[Speed calling]] (8 numbers)
| align="center" |
| align="center" |
| align="center" |
Line 141 ⟶ 159:
| align="center" | 1175
| [[Speed calling]] (30 numbers)
| align="center" |
| align="center" |
| align="center" |
Line 147 ⟶ 166:
| align="center" | 1177
| [[Anonymous call rejection]] activation
| align="center" |
| align="center" |
| align="center" |
Line 153 ⟶ 173:
| align="center" | 1178
| Do not disturb
| align="center" |
| align="center" |
| align="center" |
Line 159 ⟶ 180:
| align="center" | 1179
| Do not disturb disable
| align="center" |
| align="center" |
| align="center" |
Line 165 ⟶ 187:
| align="center" | 1180
| [[Call blocking|Call blocking disable]]
| align="center" |
| align="center" |
| align="center" |
Line 171 ⟶ 194:
| align="center" | 1181
| [[Priority call]] disable
| align="center" |
| align="center" |
| align="center" |
Line 184 ⟶ 208:
| align="center" | 1183
| Selective call forwarding disable
| align="center" |
| align="center" |
| align="center" |
Line 190 ⟶ 215:
| align="center" | 1185
| [[Caller ID|Caller ID disable]]
| align="center" |
| align="center" |
| align="center" |
Line 196 ⟶ 222:
| align="center" | 1186
| [[Continuous redial|Continuous redial cancel]]
| align="center" |
| align="center" |
| align="center" |
Line 202 ⟶ 229:
| align="center" | 1187
| [[Anonymous call rejection]] deactivation
| align="center" |
| align="center" |
| align="center" |
Line 208 ⟶ 236:
| align="center" | 1188
| Deactivate call forwarding on busy
| align="center" |
| align="center" |
| align="center" |
Line 214 ⟶ 243:
| align="center" | 1189
| [[Last-call return]] cancel
| align="center" |
| align="center" |
| align="center" |
Line 220 ⟶ 250:
| align="center" | 1190
| Conditional forward: Busy line
| align="center" |
| align="center" |
| align="center" |
Line 226 ⟶ 257:
| align="center" | 1192
| Conditional forward: No answer
| align="center" |
| align="center" |
| align="center" |
Line 232 ⟶ 264:
| align="center" | 1194
| Directed call pickup
| align="center" |
| align="center" |
| align="center" |
Line 238 ⟶ 271:
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| [[Nationwide Wireless Priority Service|Wireless Priority Service]]
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| align="center" |
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== See also ==
{{portal-inlinePortal|Telephones}}▼
* [[{{Annotated link|Mobile dial code]]}}
* [[Pat Fleet]] – Prompt voice for most U.S. [[AT&T Corp.|AT&T]] implementations of VSC features
* [[{{Annotated link|Public switched telephone network]]}}
* [[{{Annotated link|Short code]]}}
▲{{portal-inline|Telephones}}
 
==References==
Retrieved from "https://en.wikipedia.org/wiki/Vertical_service_code"