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Interchangeable numbering plan area (NPA) codes and central office codes are codes that permit any of the ten numerals in the middle position of the area code and the central office code, which both are three-digit numbers. [1] [2] This change in numbering format was implemented first for central office codes by 1973, which eliminated the ...
The Canadian Numbering Administration Consortium is the corporation responsible for administering Canada's telecommunication numbering resources. The CNA is regulated by the Canadian Radio-television and Telecommunications Commission (CRTC). [1] CNAC is headquartered in The Glebe area of Ottawa, Ontario . The CNAC selects and funds a neutral ...