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NORTH AMERICAN NUMBERING PLAN PLANNING LETTERNumber:PL-NANP-183Date:July 22, 1999From:R.C. Breidenbaugh –NANP Administration202-756-5779, rose.breidenbaugh@nanpa.comSubject:Geographic Split of 423 (Tennessee) Numbering Plan Area (NPA); addition of 865 NPAAs a result of substantial number growth in Tennessee, the 423 NPA is nearing exhaust. The relief plan,approved by the Tennessee Regulatory Authority, calls for a geographic split of the 423 NPA and thesimultaneous introduction of a new NPA, 865. The 423 NPA will continue to serve customers in thesouthwestern and northeastern portion of the existing 423 NPA. The 865 NPA will serve the centralportion of the existing 423 NPA, as shown on the attached map. After the split, exhaust of the 423 and865 NPAs is expected to occur in approximately 11 and 7 years, respectively, based on current demandprojections. A listing of communities associated with 423 and 865 NPAs is attached.Also attached are lists of current 423 NPA central office codes (NXXs) that will remain in the 423 NPAand that will move to the 865 NPA. The lists are correct as of June 1, 1999. Since NXX informationmay change over time, consult either the Local Exchange Routing Guide (LERG) or the NPA NXXActivity Guide (NNAG) for updated information. The LERG and NNAG are available from Telcordia’sTraffic Routing Administration, 732-699-6700.The split of the 423 NPA will occur at 12:01 a.m. Eastern Daylight Time on Monday, November 1,1999. A five-month permissive dialing period will begin simultaneously with the split and end at 12:01a.m. Eastern Standard Time on Monday, April 24, 2000. During the permissive dialing period either the423 or the 865 NPA code will be acceptable in a dialed number terminating in the 865 NPA. AutomaticNumber Identification (ANI) Conversion will take place during the permissive dialing period on an officeby office basis. It is essential that all service providers comply with the permissive dialing patterns asindicated in the LERG. This action will be necessary throughout the permissive dialing period to preventcall failures and customer dissatisfaction. After the permissive period, all calls dialed with the incorrectNPA code will be routed to an informational announcement.BellSouth's process for updating Operations Support System (OSS) for the Tennessee 423 NPASplit will vary from that used in the majority of previous NPA splits. In most past NPA splits,BellSouth converted its internal OSSs coincident with the beginning of permissive dialing.
(These systems support functions that include billing, service order, repair, operator services,directory listings and others.) For the Tennessee 423 split the OSS conversion will occur 15weeks after permissive dialing has already commenced. Permissive dialing will begin onNovember 1, 1999, whereas BellSouth's OSSs will be converted during the weekend of February11-13, 2000.During the interval between the permissive dialing start date and the OSS conversion date,BellSouth interfaces to other entities will continue to accept the old NPA. In addition, BellSouthdata furnished to other carriers over those interfaces will continue to carry the old NPA duringthe interval. These interfaces will begin to accept and furnish the new NPA immediately afterthe OSS conversion.From an end user perspective, most impacts from this variance will fall in the area of 'customerto-machine' interface mismatches. Customers who start to use the new NPA with servicesrequiring a telephone number input would get a 'number not found' type response during the 15weeks. However, these services would continue to work as normal with input of the old NPAuntil after the OSS conversion.After the beginning of mandatory dialing on April 22, 2000, the dialing plan for the 423 and 865 NPAs isas follows:Type of CallLocal and EASPresentRecommendedAllowableLEC optionHome NPAForeign NPA7 digits7digitsNone1 10 digits10 digits10 digitsNone7/10 digitsAll international and domestic carriers should ensure that the new 865 NPA can be translated throughouttheir networks no later than February 20, 2000. BellSouth volunteered to provide the number 865-5940494 and 865-670-1632 for test purposes. From November 1, 1999, until April 24, 2000, test calls toverify routing to the 863 NPA can be made by dialing 865-594-0494 and 865-670-1632. A recordedannouncement will indicate successful completion of the call.Questions concerning the relief of the 423 NPA should be directed to Sandy Tokarek, Senior ReliefPlanner on 412-431-4091, or Ben Childers, on 573-442-7721.Questions concerning the contents of this letter may be referred to Rose Breidenbaugh, on 202 756-5779.R. C. BreidenbaughNorth American Numbering Plan Administration
NPANPA 423423 RateRate CenterCenter OUNTAIN VANGARDENSGARDENSGARDENSGARDENSBLUFFBLUFF NSGARDENSBLUFFBLUFFCITYNEWNEW STONEYSTONEYCREEKCREEKCREEKSTONEYSTONEYSTONEY HTATETATE BAILEYTONBAILEYTONWASHBURNWASHBURNWASHBURNLALALA GAPGAPGAP LODGELODGELODGELIMESTONELIMESTONELIMESTONELAKELAKE ONJEFFERSON RSPRINGSSPRINGSSPRINGS ANPA NGSPRINGCITYCITYSPRINGSPRINGSPRING ISONAPISONAPISONAPISONAPISONProducedProduced byby CDSCDS BusinessBusiness MappingMapping INSPLAINSTELLICOTELLICOTELLICOPLAINSNPA 423 LegendCOKERCOKERCREEKCREEKCOKER NPA 423423SODDYSODDYSODDYDAISYDAISYDAISYNPANPA TIONLENOIRLENOIRLENOIR CCAYSVILLEMCCAYSVILLEMCCAYSVILLEMCCAYSVILLENPA BoundariesRate Center Boundaries
423 NPA Relief423865423Chattanooga LATAKnoxville LATAJohnson City LATA
Communities Remaining 423ApisonAthensBaileytonBall PlayBentonBlountvilleBluff CityBristolBulls Cumberland GapDaytonDecaturDeer anchFall Creek FallsFork ellicoJohnson lleMidwayMidway Sul
MorristownMosheimMountain CityNewportNewtazwellNine illeRoane MountainRobbinsRogersvilleShady ValleySneedvilleSo PittsburgSoddydaisySpring CityStoney CreekSullivan GardensSunbrightSurgoinsvilleSweetwaterTellico PlaceVonoreWartburgWhitwell
Communities Changing to 865KnoxvilleWest SweetwaterBentcreekConcordOak RidgeClintonHarrimanJefferson CityKingstonLenoircityMaryvilleGatlinburgSharp School PlaceSeviervilleSolwayClaxtonDandridgeRockwoodBean StationPowellLake CityGreenbackLoudonOliver SpringChestnut HillHlscrssrdsNorrisWashburnRutledgeMascotWhite PineMaynardvilleTate Spring
NXXs Shifting to 359362Rate LEBENTCREEKCONCORDKNOXVILLEOAK RIDGEKNOXVILLEKNOXVILLEOAK TYMARYVILLEOAK OXVILLEKNOXVILLEKNOXVILLEKNOXVILLEOAK OXVILLEKNOXVILLEKNOXVILLEDANDRIDGEROCKWOODBEAN STATNKNOXVILLEKNOXVILLEKNOXVILLEPOWELLSwitch 5216219Rate CenterBEAN STATNBEAN XVILLEKNOXVILLESwitch CDS0
NXXs Shifting to 475481GATLINBURGLAKE ILLELOUDONKNOXVILLEKNOXVILLEOAK RIDGELAKE CITYSEVIERVLSEVIERVLGATLINBURGOLIVER VLLAKE WELLKNOXVILLEJEFFERSNCYJEFFERSNCYOAK NMADS1KNVLTNMADS1KNVLTNMADS1KNVLTNMADS1
NXXs Shifting to 617631OAK RIDGEOAK OAK XVILLEKNOXVILLEKNOXVILLEKNOXVILLEKNOXVILLEOAK RIDGEOAK CM1KNVLTN02CM1
NXXs Shifting to ECONCORDKNOXVILLEWHITE LEMAYNARDVLKINGSTONKNOXVILLEKNOXVILLETATE UTLEDGESOLWAYTATE VILLEKNOXVILLEKNOXVILLELAKE CITYLAKE CITYLAKE SCTTNMTDS0KNVLTNBHDS0MYVLTNMARS0
NXXs Shifting to 80981982983984985986988992993995996WESTSWEETWWHITE PINEKNOXVILLENORRISGREENBACKOLIVER LBEAN SOAK RIDGEOAK RIDGEOAK RIDGEOAK RIDGEOAK RIDGEOAK RIDGEOAK RIDGEOAK RIDGEOAK RIDGEOAK RIDGEOAK RIDGEOLIVER SPGOLIVER WAYTATE SPGTATE HITE PINEWHITE 02DS0KNVLTNBHDS0WHPITNMADS0KNVLTNBHDS0
NXXs Remaining in 423NXXRate CenterSwitch CLLINXXRate CenterSwitch 8290CHARLESTONCHATTNOOGACHATTNOOGATELLICO KINGSPORTKINGSPORTMORRISTOWNJOHNSON CYJOHNSON CYBAILEYTONBULLS GAPAPISONNEWPORTOOLTEWAHMIDWAY TKINGSPORTKINGSPORTNEWPORTFORK RIDGEATHENSTELLICO GABLOUNTVLCHATTNOOGAJOHNSON CYJOHNSON EYTONBALL PLAYBALL UFF CITYBLUFF OLBRISTOLBULLS GAPBULLS GAPBULLS GAPBULLS NSDS1CHTGTNBRDS0CHTGTNNSVMDCHTGTN09CM1CHTGTNKVDS0
NXXs Remaining in 361363BALL IDWAY LOUNTVLCHATTNOOGABULLS GAPCLEVELANDSODDYDAISYATHENSDECATURMIDWAY HSULIVNGDNSETOWAHSWEETWATERLAFOLLETTEBALL PLAYCHURCHHILLMIDWAY SULMIDWAY CM1CHTGTN09CM1CHTGTNDTDS0CHTGTNDTDS0CHTGTNDTDS0
NXXs Remaining in CHATTNOOGACHATTNOOGABLUFF CITYKINGSPORTBULLS SYMADISONVLJOHNSON CYJOHNSON CYCHATTNOOGAMIDWAY SULMIDWAY SULMADISONVLONEIDAMOSHEIMCHATTNOOGAJOHNSON CYCHATTNOOGAJOHNSON CYJOHNSON CYJOHNSON JELLICOLAFOLLETTEJOHNSON CYRICEVILLEPETROSMIDWAYCLEVELANDCLEVELANDSTONEY TGTNGZCM1CHTGTN12XZXCHTGTNNSVMDCLEVTNMADS0
NXXs Remaining in LCHATTNOOGACHATTNOOGACOPPERBSINCHATTNOOGAMIDWAY SULCHATTNOOGACHATTNOOGAATHENSCHATTNOOGACHATTN
NORTH AMERICAN NUMBERING PLAN PLANNING LETTER Number: PL-NANP-183 Date: July 22, 1999 From: R.C. Breidenbaugh -NANP Administration 202-756-5779, rose.breidenbaugh@nanpa.com Subject: Geographic Split of 423 (Tennessee) Numbering Plan Area (NPA); addition of 865 NPA As a result of substantial number growth in Tennessee, the 423 NPA is nearing exhaust.
