NANPA Activities
NANPA Activities
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NANPA Activities
NANPA Activities
NANPA Activities
NANPA Activities
NANPA Activities

Publications

Planning Letters 1991

These Informational Letters (IL) or Planning Letters (PL) may be downloaded from this web site. These files require the use of the Adobe Acrobat Reader.

Number Subject Date
IL-91-10-058 NANP-SPLIT OF THE 404 NUMBERING PLAN AREA (NPA) AND DIALING PROCEDURE CHANGES IN THE 912 NPA IN THE STATE OF GEORGIA Oct 1991
IL-91-08-009 NANP-REVISED NPA MAP SHOWING NEW NPAS SCHEDULED TO BE INTRODUCED IN 1992 AND 1993 Aug 1991
IL-91-08-001 NANP-INTRODUCTION OF THE 917 NUMBERING PLAN AREA (NPA) IN NEW YORK CITY AND TRANSFER OF THE BRONX, NEW YORK, FROM THE 212 NPA TO THE 718 NPA Aug 1991
IL-91-06-044 NANP - CORRECTIVE CONSIDERATIONS FOR ELIMINATION OF BLOCKED NETWORK CALLS FROM CERTAIN CUSTOMER PREMISES EQUIPMENT Jun 1991
IL-91-05-035 NANP - INTRODUCTION OF INTERCHANGEABLE CENTRAL OFFICE CODES IN THE TEXAS 713 NPA May 1991
IL-91-05-028 INTEGRATION OF PUBLIC NON-LEC ISDNS INTO THE NORTH AMERICAN NUMBERING PLAN May 1991
IL-91-03-009 NANP-INTRODUCTION OF INTERCHANGEABLE CENTRAL OFFICE CODES IN THE 714 NPA Mar 1991
IL-91-02-030 NANP - REVISED NPA MAP SHOWING NEW NPAS SCHEDULED TO BE INTRODUCED IN 1991 Feb 1991
IL-91-01-045 NANP - INTRODUCTION OF INTERCHANGEABLE CENTRAL OFFICE CODES IN THE 206 NPA Jan 1991

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