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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 ...
A telephone numbering plan is a system used in telecommunications to give telephone numbers to customers and to route telephone calls in a telephone network. A closed numbering plan imposes a fixed length to numbers, such as in North America (10-digit). An open numbering plan may have telephone numbers that vary in length.
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What is a telephone numbering plan?
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 the North American Numbering Plan (NANP), interchangeable NPA and central office codes constituted a change in numbering plan design and policy, to mitigate exhaustion of the numbering resources of the ten-digit telephone numbers used in the closed numbering plan of the NANP.
Dec 3, 2012 · The North American Numbering Plan (NANP) is the basic numbering scheme permitting interoperable telecommunications services within the U.S., Canada, Bermuda, and most of the Caribbean.Section 251 (e) (1) of the Act required the Commission to create or designate one or more impartial entities to administer telecommunications numbering and to make...
[1] History. In the 1940s, the American Telephone and Telegraph Company (AT&T) devised the first comprehensive continental telephone numbering plan to implement destination routing in Operator Toll Dialing with the goal of speeding the connection times in long-distance telephony.
