E.123
E.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. It provides guidelines for the presentation of telephone numbers, email addresses, and web addresses in print, on letterheads, and similar purposes.
| Notation for national and international telephone numbers, e-mail addresses and web addresses | |
| Status | In force |
|---|---|
| Latest version | (02/01) February 2001 |
| Organization | ITU-T |
| Related standards | E.163, E.164 |
| Domain | telephony |
| License | Freely available |
| Website | https://www.itu.int/rec/T-REC-E.123 |
As described by the ITU, in E.123: "+" is the "International Prefix Symbol" used in a "Telephone number, E.123 international notation".
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