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The Alliance for Telecommunications Industry Solutions, 09/01/2023
Publisher: ATIS
File Format: PDF
$105.00$211.53
Published:01/09/2023
File Size:1 file , 4.8 MB
This document specifies guidelines for the administration and assignment of CO Codes (NPA-NXX), and Thousands-Blocks (NPA-NXX-Xs) to Local Number Portability (LNP)-capable SPs within geographic numbering plan areas (NPAs). This does not preclude a future effort to address non-geographic NPA in the same guidelines. Throughout these guidelines the term Numbering Resources shall be used when referencing both CO Codes and Thousands-Blocks.
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