258:, the extension number should be written directly after the phone number, without using any distinct symbols. If there is a need to indicate in-dialing capability of the telephone number, a number of dots (....) corresponding to the length of the extension number can be added at the end.
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In the international telephone number notation, the leading plus (+) serves as an international prefix symbol, and is immediately followed by the country code. The user or the telephone system should replace the + symbol with international dialing prefix used in the caller's location.
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In the handset's directory this would be displayed as "01Anna" or "01Spouse" enabling easy identification by the emergency services. The handsetâs directory entry (in the âcontact numberâ field) would contain the actual number of the person to call in case of emergency.
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can be included with the area code if required by national writing conventions; trunk prefix is included in most
European countries whenever they use fixed or variable dialing, but is omitted in USA and Canada where phone numbers only indicate optional area code.
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fax, modem, and telephone equipment. Depending on the user's current location, the
Windows' Dial-Up Networking (DUN) component applies a set of dialing rules to transform the canonical phone number into a locally dialable calling sequence for the
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A standardized language-independent way to identify a next-of-kin (or other emergency contact) in a mobile handsetâs directory, in case of an emergency, has in May 2008 been adopted as a new clause in
Recommendation E.123.
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With this approach, phone numbers stored in the phone book remain unchanged when the user moves to a different geographical location or selects a different phone service provider.
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only spaces be used to visually separate groups of numbers "unless an agreed upon explicit symbol (e.g. hyphen) is necessary for procedural purposes" in national notation;
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device. The dialing rules may include variable-length dialing for area code, trunk access and international access prefixes, central office/service access numbers, and
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in the form â0nxxxxâ; ânâ is a digit from 1 through 9 and âxxxxâ is any meaningful descriptive character string in any language or script (e.g. âAnnaâ or âSpouseâ).
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canonical address format for telephone numbers derives from E.123 international notation by allowing explicit indication of area code with parentheses.
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251:(private branch exchange) extension number should be separated by words "extension" or "ext." in the national language after the phone number.
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No recommendation is made for grouping rules for digits in the local number, instead some examples of commonly used groupings are shown.
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is an international standard by the
Telecommunication Standardization Sector of the International Telecommunication Union (
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allowed in the international notation, according to the standard, as international callers use fixed number dialing.
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Parentheses are used in national notation to indicate digits that are sometimes not dialed, such as area code in
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390:"E.123: Notation for national and international telephone numbers, e-mail addresses and Web addresses"
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A slash (/) with spaces on either side may be used to indicate alternative ending for numbers (i.e.
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Notation for national and international telephone numbers, e-mail addresses and Web addresses
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Notation for national and international telephone numbers, e-mail addresses and Web addresses
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only spaces should be used to visually separate groups of numbers in international notation;
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MSDN: TAPI Applications - Device
Control - Storing Phone Numbers in Electronic Address Book
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460:"ITU standard allows emergency rescue workers to identify a victim's next-of-kin"
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466:. International Telecommunication Union. 20 May 2008. Archived from
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The calling sequence can contain dialable numbers such as digits
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spaces should separate country code, area code and local number.
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This language-independent recommendation preceded the popular
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Microsoft
Technet: Dialing Rules and Canonical Address Format
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It proposes to store emergency contact numbers prefixed with
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MSDN: TAPI Applications - Device
Control - Canonical Address
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Telephone number, national notation (full number dialing)
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scheme introduced in 2005 to the
English-speaking world.
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For digit grouping, E.123 specifically recommends that:
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Bob's idea has global impact (Cambridge
Evening News)
319:, which correspond to the Dial command of the Hayes
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360:National conventions for writing telephone numbers
112:. It provides guidelines for the presentation of
124:in print, on letterheads, and similar purposes.
152:Telephone number, E.123 international notation
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127:As described by the standard, â¨+⊠is the
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272:The canonical format is used by the
223:A tilde (~) indicates an additional
94:https://www.itu.int/rec/T-REC-E.123
14:
262:Microsoft telephone number format
191:numbering plans. Parentheses are
400:from the original on 2019-11-11
227:that the user should wait for.
662:ITU-T E Series Recommendations
1:
370:List of country calling codes
327:Emergency contact information
621:National writing conventions
348:"ICE" (In Case of Emergency)
317:! P T , W @ $ ? ;
254:When the PBX is capable of
129:international prefix symbol
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215:In national notation, the
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494:February 3, 2009, at the
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311:, formatting characters
189:variable-length dialing
256:direct inward dialing
274:Telephony API (TAPI)
16:ITU-T Recommendation
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21:
657:Network addressing
470:on 19 October 2016
169:Domain name / Web
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652:Telephone numbers
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547:Telephone numbers
247:The non-dialable
232:"555 1234 / 4444"
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155:+22 607 123 4567
114:telephone numbers
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58:Related standards
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43:February 2001
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549:by continent
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472:. Retrieved
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402:. Retrieved
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217:trunk prefix
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108:), entitled
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48:Organization
394:www.itu.int
641:Categories
604:Antarctica
404:2019-11-11
376:References
267:Microsoft
225:dial tone
76:telephony
587:Americas
492:Archived
398:Archived
354:See also
242:555 4444
236:555 1234
33:In force
597:Oceania
278:dial-up
90:Website
82:License
41:(02/01)
577:Europe
563:Africa
474:24 May
313:⣠. -
309:ABCD*#
307:tones
234:means
120:, and
72:Domain
30:Status
647:Email
626:E.123
365:E.164
283:modem
106:ITU-T
102:E.123
66:E.164
62:E.163
52:ITU-T
20:E.123
570:Asia
476:2008
305:DTMF
303:and
249:PBX
244:).
239:and
193:not
643::
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427:^
413:^
396:.
392:.
323:.
116:,
64:,
539:e
532:t
525:v
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449:.
437:.
407:.
301:9
299:â
297:0
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