E.123
E.123, also known as Notation for national and international telephone numbers, e-mail addresses and Web addresses is an ITU-T standard for printed representation of telephone numbers, e-mail addresses, and web addresses.
[edit] Example formats
E.123 specifically recommends that:
In national notation, parentheses are used to indicate digits that are sometimes not dialled.
Parentheses should not be used in the international notation.
A slash (/) may be used to indicate alternate numbers. (i.e. "555 1234/4444" means 555 1234 and 555 4444.)
[edit] In case of emergency
A standardized language-independent way to identify a next-of-kin (or other emergency contact) in a mobile handset’s directory, in case of an emergency, has in May 2008 been adopted as a new clause in Recommendation E.123.
It proposes to store emergency contact numbers prefixed with Arabic numerals in the form “0nxxxxâ€; “n†is a digit from 1 through 9 and “xxxx†is any meaningful descriptive character string in any language or script (e.g. “Anna†or “Spouseâ€).
In the handset's directory this would be displayed as "01Anna" or "01Spouse" enabling easy identification by the emergency services. The handset’s directory entry (in the “contact number†field) would contain the actual number of the person to call in case of emergency.[1]
This scheme is a language-independent version of the "ICE" (In Case of Emergency) scheme that became popular in certain parts of the world from 2005 onwards.[2]
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