Is att still down
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Sep 28, 2020 ·
[DOCX File]Payment of attorney or agent fees (U.S. Department of ...
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Questions and Answers - AT&T
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The Top-down/Bottom-up Model involves a two-stage process. The first stage, Top-down analysis, uses historical COCUS data and mathematical modeling to develop initial exhaust forecasts for each area code. Once the NANPA determines that a particular NPA will exhaust within a selected period, the second stage of the model is applied.
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