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A broad division is commonly recognized between closed and open numbering plans. A closed numbering plan, as found in North America, features fixed-length area codes and local numbers, while an open numbering plan has a variance in the length of the area code, local number, or both of a telephone number assigned to a subscriber line. The latter ...
- Telephone numbering plan - Simple English Wikipedia, the free ...
A telephone numbering plan is a system used in...
- Closed numbering plan - Wikipedia
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- Telephone numbering plan - Simple English Wikipedia, the free ...
This rounded the total number of digits in a subscriber telephone number to ten: a three-digit area code, three-digit central office code, and four digits for each line. This fixed format defined the North American Numbering Plan as a closed numbering plan, as opposed to developments in other countries where the number of digits was not fixed.
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Feb 19, 2024 · This article will explain global telephone numbering plans, the differences between open and closed ones, and the common ways to format telephone numbers across various countries. Closed Versus Open Numbering Plans. Closed numbering plans contain a fixed number of digits for each telephone number.
- Luke Genoyer
In telecommunication, a dial plan (or dialing plan) establishes the permitted sequences of digits dialed by telephone subscriber and the manner in which a telephone switch interprets these digits within the definitions of the prevailing telephone numbering plan.
The initial Nationwide Numbering Plan of 1947 established eighty-six numbering plan areas (NPAs) that conformed mainly to existing U.S. state and Canadian provincial boundaries, though fifteen states and provinces were subdivided further. Forty NPAs were mapped to entire states or provinces.
