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The Alliance for Telecommunications Industry Solutions,
Publisher: ATIS
File Format: PDF
$131.00$262.46
Access Service Request (ASR) Guidelines
$135.00 $271.19
Structure and Representation of Network Channel (NC) and Network Channel Interface (NCI) Codes for Information Exchange
$122.00 $244.82
$133.00 $266.15
NPA Code Relief Planning and Notification Guidelines
$105.00 $210.23