On October 30, 2019, ATIS?0300051, Central Office Code (NXX) Assignment Guidelines (COCAG) and ATIS-0300066, Thousands-Block Number(NXX-X) Pooling Administration Guidelines (TBPAG) were superseded by a single document, ATIS-0300119, Thousands-Block (NPA-NXX-X) & Central Office Code (NPA-NXX) Administration Guidelines (TBCOCAG).
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ATIS 1000098
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