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The Alliance for Telecommunications Industry Solutions, 12/01/2011
Publisher: ATIS
File Format: PDF
$109.00$219.78
Published:01/12/2011
Pages:13
555 NXX Line Number Reference Document
$119.00 $238.09
Industry Guidelines for Toll Free Number Administration
$104.00 $209.07
Location Accuracy Improvements for Emergency Calls
$137.00 $275.00
Central Office Code (NXX) Assignment Guidelines (COCAG)
$123.00 $246.69