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The Alliance for Telecommunications Industry Solutions, 03/01/2023
Publisher: ATIS
File Format: PDF
$148.00$296.96
Published:01/03/2023
File Size:1 file , 5.6 MB
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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Non-Geographic 5XX-NXX Code Assignment Guideliness
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