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The Alliance for Telecommunications Industry Solutions , 10/01/2024
Publisher: ATIS
File Format: PDF
$91.00$182.73
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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