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{{Short description|Telephone dialing code for access to service features}}
A '''vertical service code''' is a ficticious [[telephone number]] that usually begins with the * (star) key on the [[touch tone]] keypad. Some cellular companies also use # to begin a vertical service code.
{{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''.
List of vertical service codes (not all of these services are available in all areas, some are only available to [[wireline]] telephones (and unavailable to [[cellular]] callers) and some require additional services be purchased from the [[telephone company]] to use them):
 
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.
* *67 - Private call - Informs telephone switch not to release [[caller-id]] information for this particular call.
* *69 - Return call - Call back the last party that dialed this number. If the caller did not use *67, this service will usually read back their number before placing the call to them.
* *70 - Cancel Call Waiting - Informs telephone switch not to activate [[call waiting]] service for this telephone call. Service will resume after this call is terminated.
 
==Feature definitions==
{{msg:stub}}
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="NANPA" /><ref>{{Cite magazine |title=The #Hack 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>
 
{| class="wikitable sortable"
|-
! colspan="2" | Vertical service code
! rowspan="2" | Service definition
! rowspan="2" | Australia
! rowspan="2" | Japan
! rowspan="2" | UK
|-
! 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
| align="center" | 1167
| Calling number delivery blocking
| align="center" | 1831<br>#31#<ref>1831 on landlines, or #31# from a mobile</ref><ref>{{cite web|title=HOW TO: block your number when calling someone|url=https://exchange.telstra.com.au/how-to-block-your-number-when-calling-someone/|website=Telstra Exchange|publisher=Telstra|access-date=28 May 2017}}</ref>
| align="center" |
| align="center" | 141<br>#31#<ref>141 on landlines and #31# on mobiles</ref>
|-
| align="center" | *68
| align="center" | 1168
| Activate call forwarding on busy
| align="center" |
| align="center" |
| align="center" |
|-
| align="center" | *69
| align="center" | 1169
| [[Last-call return]] (incoming)
| align="center" | *69 HFC<br> *10#<ref>*10# for [[Telstra]] services [http://www.telstra.com.au/homephone/features_services/call_return.html "Telstra Home Phones and Plans – Call Return"] {{webarchive|url=https://web.archive.org/web/20110314000130/http://www.telstra.com.au/homephone/features_services/call_return.html |date=March 14, 2011 }}</ref><ref> *69 on [[Optus]] HFC Telephony network. [http://personal.optus.com.au/web/ocaportal.portal?_nfpb=true&_pageLabel=Template_wRHS&FP=/personal/customerhelp/producthelp/homephonehelp/homephonehowtoguides/usingcallreturn&site=personal "Optus Personal – Using Call Return"] This only allows one to return the last unanswered call, and can cost 35 cents per use.</ref>
| align="center" | 1361<br>1363<ref>1361 to get number, 1363 to call back. {{cite web |url=http://www.ntt-east.co.jp/release/0007/000717b.html |title=NewsRelease |website=NTT East |access-date=June 20, 2013}} {{cite web |url=http://www.ntt-west.co.jp/denwa/service/136/gaiyou.html |title=Number OSIRASE 136 |website=NTT West |access-date=June 20, 2013}}</ref>
| align="center" | 1471<ref>After dialing 1471, the caller can press "3" to automatically return the call. Previously free, since August 2004 the return call service incurs a charge.</ref>
|-
| align="center" | *70
| 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
| align="center" | 1182
| [[*82|Caller ID (per call)]]
| align="center" | *31#/1832<ref>1832 on landlines, or *31# from a mobile</ref>
| align="center" |
| align="center" | 1470
|-
| align="center" | *83
| 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
* {{Annotated link|Public switched telephone network}}
* {{Annotated link|Short code}}
 
==References==
{{Reflist}}
 
==External links==
* [http://portal.etsi.org/HF/hf_service_codes.asp ETSI Supplementary service codes]
 
{{FS1037C}}
 
[[Category:Calling features]]
[[Category:North American Numbering Plan]]
[[Category:Telephone numbers in Canada]]