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Central office code protection

In the administration of the North American Numbering Plan, central office code protection is a numbering policy for maintaining local seven-digit dialing in communities that extend on both sides of the boundary line between multiple numbering plan areas (NPAs), such as in cross-border towns on state lines. Code protection prevents the use of the same…

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Central office code protection

Nodes45
Edges44
Triples3
Avg. degree1.96
Density0.044444
Components1

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Central office code protection

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Central office code protection → numbering policy for maintaining local seven-digit dialing in communities that extend on both sides of the boundary line between multiple numbering plan areas

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Important terminology

code area protection local central office seven-digit number boundary numbering codes could prefixes calls state use assigned calling plan one

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SubjectPredicateObjectConfidenceSrc
Central office code protectionis anumbering policy for maintaining local seven-digit dialing in communities that extend on both sides of the boundary line between multiple numbering plan areas0.90text
Stinstance ofbut can consume numbers rapidly in larger centers0.80text
southwestern Virginia or the Eastern Shore of Maryland.Severing the border community from its exhausted home area code using a split plan may prolong the life of a seven-digit exchange code protection scheme if the piece being split off is outside the extended local calling areainstance ofit could not be used even in areas a safe distance from Washington0.80text

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