scope:

This technical requirements document defines the Switching System, Number Portability Database (NPDB), and Number Portability Global Title Translation (NP GTT) requirements for Thousands Block Number Pooling¹ in Number Portability (NP) capable wireline networks. This uses the Location Routing Number (LRN) method for number portability. Thousands Block Number Pooling shares an NPA-NXX among carriers allocating numbers in blocks of onethousand numbers with the same NPA-NXX-X. The pooling of numbers in blocks smaller than one-thousand (e.g., Individual Telephone Number Pooling) and the pooling of numbers outside a rate center are not addressed...

¹ To avoid confusion with the acronym for number portability (NP), this document does not use an acronym for number pooling.