This document specifies guidelines for the administration and assignment of Central Office (CO) Codes (NPA-NXX) and Thousands-Blocks (NPA-NXX-Xs) to Local Number Portability (LNP)-capable Service Provider (SPs) within geographic numbering plan areas (NPAs).
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Thousands-Block (NPA-NXX-X) & Central Office Code (NPA-NXX) Administration Guidelines
The Alliance for Telecommunications Industry Solutions , 04/01/2023
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