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The Alliance for Telecommunications Industry Solutions, 10/01/2021
Publisher: ATIS
File Format: PDF
$134.00$269.18
Published:01/10/2021
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).
Thousands-Block Number (NXX-X) Pooling Administration Guidelines
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555 NXX Line Number Reference Document
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Industry Guidelines for Toll Free Number Administration
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Location Accuracy Improvements for Emergency Calls
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