Public Comment Filings
Link to North American Numbering Plan Notice of Inquiry.
Telco Planning Comments on Number Assignment in the NXX 555
Face to Face Presentation at Request of FCC
555 NXX for Directory Assistance Only @point 50.
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Industry Standards Work - ATIS (T-1, INC, MPC, IILC, ICCF)
ITU Operational Bulletin page 83
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PSTN Databases