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E.123 is standards-based recommendation by the International Telecommunications Union sector ITU-T, and is entitled ''Notation for national and international telephone numbers, e-mail addresses and Web addresses''. It provides guidelines for the presentation of telephone numbers, email addresses, and web addresses in print, on letterheads, and similar purposes. ==Example formats== E.123 specifically recommends that: * 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. * only spaces should be used to visually separate groups of numbers in international notation. In national notation which follows E.123 recommendations, parentheses are used to indicate digits that are sometimes not dialled. Parentheses are ''not'' allowed in the international notation, according to the standard. Microsoft telephone numbers format derives from E.123 telephone number international notation by allowing the addition of area code, delimited by parentheses. A slash (/) with spaces on either side may be used to indicate alternative numbers. (i.e. "555 1234 / 4444" means 555 1234 and 555 4444.) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「E.123」の詳細全文を読む スポンサード リンク
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