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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. The latter type developed predominantly in Europe.
The presentation of a telephone number with the plus sign indicates that the number should be dialed with an international calling prefix, in place of the plus sign. The number is presented starting the country calling code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806. [6]
For example, the Indiana numbering plan area 317 was divided to provide a larger numbering pool in the Indiana suburbs of Chicago (area code 219). [ citation needed ] Initially, states divided into multiple numbering plan areas were assigned area codes with the digit 1 in the second position, while areas that comprised entire states or ...
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
There are also 80 area codes reserved for future expansion of the numbering system, that is, those whose middle digit is 9. Article North American Numbering Plan expansion tells how they might be used. This makes a total of 322 currently unused area codes, or 40% of the total space of 800 possible area codes.
Area codes with the middle digit 0 were assigned to numbering plan areas that comprised an entire state or province, while jurisdictions with multiple numbering plan areas received area codes having 1 as the second digit. This pattern lasted only until 1956, when New Jersey's "201" was divided.
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MasterFormat is a standard for organizing specifications and other written information for commercial and institutional building projects in the U.S. and Canada. [1] Sometimes referred to as the "Dewey Decimal System" of building construction, MasterFormat is a product of the Construction Specifications Institute (CSI) and Construction Specifications Canada (CSC).
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