4/27/2023 0 Comments Easy numbering 123![]() The dialing rules may include variable-length dialing for area code, trunk access and international access prefixes, central office/service access numbers, and calling cards tone numbers. 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 modem device. The canonical format is used by the Telephony API (TAPI), a Windows programming interface for dial-up fax, modem, and telephone equipment. Microsoft canonical address format for telephone numbers derives from E.123 international notation by allowing explicit indication of area code with parentheses. ![]() 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. When the PBX is capable of direct inward dialing, the extension number should be written directly after the phone number, without using any distinct symbols. The non-dialable PBX (private branch exchange) extension number should be separated by words "extension" or "ext." in the national language after the phone number. In national notation, the trunk prefix 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.Ī tilde (~) indicates an additional dial tone that the user should wait for.Ī slash (/) with spaces on either side may be used to indicate alternative ending for numbers (i.e. No recommendation is made for grouping rules for digits in the local number, instead some examples of commonly used groupings are shown. spaces should separate country code, area code and local number.only spaces should be used to visually separate groups of numbers in international notation.hyphen) is necessary for procedural purposes" in national notation only spaces be used to visually separate groups of numbers "unless an agreed upon explicit symbol (e.g.Parentheses are not allowed in the international notation, according to the standard, as international callers use fixed number dialing.įor digit grouping, E.123 specifically recommends that: Parentheses are used in national notation to indicate digits that are sometimes not dialed, such as area code in variable-length dialing numbering plans. The user or the telephone system should replace the + symbol with international dialing prefix used in the caller's location. In the international telephone number notation, the leading plus (+) serves as an international prefix symbol, and is immediately followed by the country code. Telephone number, E.123 international notation It provides guidelines for the presentation of telephone numbers, email addresses, and web addresses in print, on letterheads, and similar purposes.Īs described by the ITU, in E.123: "+" is the "International Prefix Symbol" used in a "Telephone number, E.123 international notation".Įxample formats Telephone number, national notation (full number dialing) ITU-T Recommendation E.123 Notation for national and international telephone numbers, e-mail addresses and web addressesĮ.123 is an international standard by the standardization union ( ITU-T), entitled Notation for national and international telephone numbers, e-mail addresses and web addresses.
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