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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.
- Telephone numbering plan - Simple English Wikipedia, the free ...
A telephone numbering plan is a system used in...
- Open numbering plan - Wikipedia
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- Telephone numbering plan - Simple English Wikipedia, the free ...
The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1 .
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.
Many countries outside the NANP have open numbering plans in which the size of telephone numbers or area codes can be expanded as needed in each locality. In the North American Numbering Plan incremental changes were avoided, and delayed until the entire numbering plan requires expansion.
A fundamental requirement for the success of automated toll dialing was a new telephone numbering plan, which became known as the Nationwide Numbering Plan. This numbering plan accounted initially for seventy-seven area codes in the United States and nine in Canada.
