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Publications

Planning Letters 1998

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
PL-147 Jeopardy Declared for 314 in Missouri November 23, 1998
PL-146 Introduction of Interchangeable Central Office Codes in Nebraska November 18, 1998
PL-145 Extraordinary NPA-Specific Jeopardy Conservation Procedures Announced for Wisconsin NPA 414 October 5, 1998
PL-144 Extraordinary NPA-Specific Conservation Procedures for 403 NPA in Alberta October 19, 1998
PL-143 Elimination of 713/281 (Houston, TX) Split Line and introduction of Overlay NPA 832 October 15, 1998
PL-142 Elimination of 214/972 (Dallas, TX) Split Line and Introduction of 469 Overlay for Dallas, Texas October 15, 1998
PL-141 Jeopardy Conservation Procedures Announced for Louisiana NPA 504 and Reminder of the Extended Mandatory Date of 8/16/99 for Cellular Service October 5, 1998
PL-140 Jeopardy Conservation Procedures Announced for Kentucky NPA 502 October 5, 1998
PL-139 Automatic Number Identification Digits (ANI II) for Pay Phone Compensation October 5, 1998
PL-138 Extraordinary NPA-Specific Jeopardy Conservation Procedures Announced for Connecticut NPAs 203 & 860 October 5, 1998
PL-137 Extraordinary Jeopardy Procedures for 714 NPA in California October 5, 1998
PL-136 NANP-Split of 717 (Pennsylvania) Numbering Plan Area (NPA) July 29, 1998
PL-135 NANP-Overlay of 610 (Pennsylvania) Numbering Plan Area (NPA) with 484 NPA July 31, 1998
Revised: August 7, 1998
PL-134 NANP-Overlay of 215 (Pennsylvania) Numbering Plan Area (NPA) with 267 NPA July 31, 1998
Revised: August 7, 1998
PL-133 Reminder notification for Numbering Plan Area (NPA) 813 (Florida) Permissive dialing beginning July 1, 1998 July 29, 1998
PL-132 Extraordinary Jeopardy Procedures for 616 NPA in Michigan July 24, 1998
PL-131 Extraordinary Jeopardy Procedures for 601 NPA in Mississippi July 24, 1998
PL-130 Extraordinary Jeopardy Procedures for 818 NPA in California July 24, 1998
PL-129 Extraordinary Jeopardy Procedures for 650 NPA in California July 24, 1998
PL-128 NANP-Phased three-way split of 619 (California) Numbering Plan Area (NPA) with 858 & 935 NPAs June 30, 1998
PL-127 NANP-Overlay of 847 (Illinois) Numbering Plan Area (NPA) with 224 NPA June 30, 1998
PL-126 Extension of Permissive Dialing Period for Utah 801 and 435 NPA Relief; Reference PL-NANP-065 June 12, 1998
PL-125 NANP-Overlay of 310 (California) Numbering Plan Area (NPA) with 424 NPA May 26, 1998
PL-124 Extraordinary Jeopardy Procedures for 914 Numbering Plan Area (NPA) in New York May 26, 1998
PL-123 NANP-Split of 504 (Louisiana) Numbering Plan Area (NPA) June 9, 1998
Revised: August 6, 1998
PL-122 Extraordinary Jeopardy Procedures for 508, 617, 781 and 978 Numbering Plan Area (NPA) in Massachusetts June 9, 1998
PL-121 NANP Split of 813 (Florida) Numbering Plan Area (NPA); This superceded PL-NANP-109 that advised of an 813 NPA Overlay. April 21, 1998
PL-120 NANP Split of 612 (Minnesota) Numbering Plan Area (NPA) April 21, 1998
PL-119 Notification of Assignment of 882 NPA for Inbound Foreign Billed Calls to Toll-Free Numbers April 9, 1998
PL-118 NANP-Split of 702 (Nevada) Numbering Plan Area (NPA) March 25, 1998
PL-117 NANP-Overlay of 303 (Colorado) Numbering Plan Area (NPA) with 720 NPA March 24, 1998
PL-116 NANP-Concentrated Overlay of 305 Numbering Plan Areas (NPA) in Florida March 6, 1998
PL-115 Extraordinary NPA-Specific Jeopardy Conservation Procedures Announced for 909 NPA (California) March 2, 1998
PL-114 BellSouth Operation Support Systems Update and the Alabama and North Carolina NPA Splits March 2, 1998
PL-113 NPA 876 Conversion Extension for Jamaican NPA Relief March 2, 1998
PL-112 NANP-Split of 919 (North Carolina) Numbering Plan Area (NPA) February 27, 1998
PL-111 NANP-Split of 805 (California) Numbering Plan Area (NPA) February 12, 1998
PL-110 NANP-Split of 205 (Alabama) Numbering Plan Area (NPA) February 3, 1998
PL-109 NANP-OVERLAY OF 813 (FLORIDA) Numbering Plan Area (NPA) February 3, 1998
PL-108 NPA Test Number Change for the New 530 Numbering Plan Area (NPA) in California January 5, 1998

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