Structure
Most telephone numbers belong to the E.164 numbering plan, though some PABXs (business telephone systems) have internal extensions.
The E.164 numbering plan for telephone numbers includes:
- Country calling codes
- Regional numbering plans, such as:
- the European Telephony Numbering Space
- the North American Numbering Plan
- Various national numbering plans, such as:
- Telephone numbers in the United Kingdom
Apart from the use of numbering plans for telephone numbers, they are also used in routing of SS7 signalling messages as part of the Global Title. In public land mobile networks, the E.212 numbering plan is used for subscriber identities (e.g. stored in the GSM SIM) while E.214 is used for routing database queries across PSTN networks.
Read more about this topic: Telephone Numbering Plan
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—Sarah Patton Boyle, U.S. civil rights activist and author. The Desegregated Heart, part 2, ch. 2 (1962)