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scratchytcarrier

(REFERENCE) Mistman's NPA list, for your convenience

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I keep forgetting to post this so now I am before I forget again. here is a list of the current NPAs compiled by Mistman with I think some assistance from Wiki. The date stamp on the top says June 2015 but he has since updated it and this dump is from March of this year.

http://mistman.pdp10.org/pub/phone/npa-list.txt


North American Numbering Plan (NANP) Numbering Plan Area (NPA) (area code) list
2015~June 08

NOTE: NPA codes x9y are not used for public telephone systems under the NANP,
with exceptions--see below.

$ Part of country code 1 but billed international rate when dialled from the US
* Not a valid NPA code under the NANPA regulations
@ Pseudo-NPA used as an exchange code on a local basis only
~ Local/national N11 service (eg. 911 emergency), not an NPA code
! Not a valid NPA code for public telephone systems but used internally by
telephone companies for testing, engineering or administrative purposes
# Proposed or reserved for future use/expansion
% Retained for historic or compatibility reasons, but no longer supported or
widely used by telephone companies
^ Obsolete but still listed under the NANPA database and phreak documents
& Valid but not used due to cultural or political reasons


NPA Region Overlay
200
201 New Jersey 201/551
202 District of Columbia
203 Connecticut 203/475
204 Manitoba 204/431
205 Alabama 205/659
206 Washington
207 Maine
208 Idaho
209 California
210 Texas
211~ Community service N11 (national)
212 New York 212/646/917
213 California
214 Texas 214/469/972
215 Pennsylvania 215/267
216 Ohio
217 Illinois 217/447
218 Minnesota
219 Indiana
220
221
222
223
224 Illinois 847/224
225 Louisiana
226 Ontario 519/226
227 Maryland 301/240/227
228 Mississippi
229 Georgia
230
231 Michigan
232
233
234 Ohio 330/234
235
236 British Columbia
237
238
239 Florida
240 Maryland 301/240/227
241
242 Bahamas
243
244
245
246 Barbados
247
248 Michigan 248/947
249 Ontario 705/249
250 British Columbia 250/778
251 Alabama
252 North Carolina
253 Washington
254 Texas
255
256 Alabama 256/938
257
258
259
260 Indiana
261
262 Wisconsin
263
264$ Anguilla
265
266
267 Pennsylvania 215/267
268$ Antigua and Barbuda
269 Michigan
270 Kentucky
271
272 Pennsylvania 570/272
273
274 Wisconsin 920/274
275
276 Virginia
277
278
279
280
281 Texas 713/281/832
282
283 Ohio 513/283
284$ British Virgin Islands
285
286
287
288
289 Ontario 905/289/365
290
291
292
293
294
295
296
297
298
299



NPA Region Overlay
300
301 Maryland 301/240/227
302 Delaware
303 Colorado 303/720
304 West Virginia 304/681
305 Florida 305/786
306 Saskatchewan
307 Wyoming
308 Nebraska
309 Illinois
310 California 310/424
311~
312 Illinois 312/872
313 Michigan
314 Missouri 314/557
315 New York
316 Kansas
317 Indiana
318 Louisiana
319 Iowa
320 Minnesota
321 Florida
322
323 California
324
325 Texas
326
327 Arkansas 870/327
328
329
330 Ohio 330/234
331 Illinois 630/331
332
333
334 Alabama
335
336 North Carolina
337 Louisiana
338
339 Massachusetts 781/339
340 US Virgin Islands
341 California
342
343 Ontario 613/343
344
345$ Cayman Islands
346
347 New York 718/347/917/929
348
349
350
351 Massachusetts 978/351
352 Florida
353
354
355
356
357
358
359
360 Washington 564/360 (proposed)
361 Texas
362
363
364 Kentucky
365 Ontario 905/289/365
366
367
368
369 California
370
371
372
373
373
374
375
376
377
378
379
380 Ohio 614/380
381
382
383
384
385 Utah 801/385
386 Florida
387
388
389
390
391
392
393
394
395
396
397
398
399


NPA Region Overlay
400
401 Rhode Island
402 Nebraska 402/531
403 Alberta 403/587
404 Georgia 404/678/470
405 Oklahoma
406 Montana
407 Florida 407/689
408 California 408/669
409 Texas
410 Maryland 410/443/667
411~
412 Pennsylvania 412/878
413 Massachusetts
414 Wisconsin
415 California
416 Ontario 416/647
417 Missouri
418 Quebec 418/581
419 Ohio 419/567
420
421
422
423 Tennessee
424 California 310/424
425 Washington (Seattle)
426
427
428 New Brunswick
429
430 Texas 903/430
431 Manitoba 204/431
432 Texas
433
434 Virginia
435 Utah
436
437 Ontario
438 Quebec 514/438
439
440 Ohio
441$ Bermuda
442 California 760/442
443 Maryland 410/443/667
444
445
446
447 Illinois 217/447
448
449
450 Quebec 450/579
458 Oregon (Eugene metro) 541/458
459
460 Ontario
461
462
463
464 Illinois 708/464
465
466
467
468
469 Texas 214/469/972
470 Georgia 404/678/470; 770/678/470
471
472
473$ Grenada
Carriacou
Petite Martinique
474
475 Connecticut 203/475
476
477
478 Georgia
479 Arkansas
480 Arizona
481
482
483
484 Pennsylvania 610/484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499



NPA Region Overlay
500% WATS (personal)
501 Arkansas
502 Kentucky
503 Oregon (northern/PDX) 503/971
504 Louisiana
505 New Mexico
506 New Brunswick
507 Minnesota
508 Massachusetts 508/774
509 Washington
510 California
511~
512 Texas 512/737
513 Ohio 513/283
514 Quebec 514/438
515 Iowa
516 New York
517 Michigan
518 New York
519 Ontario 519/226
520 Arizona
521
522
523
524
525
526
527
528
529
530 California
531 Nebraska 402/531
532
533
534 Wisconsin 715/534
535
536
537
538
539 Oklahoma 918/539
540 Virginia
541 Oregon (E/SW) 541/458
542
543
544
545
546
547
548 Ontario
549
550% WATS (personal)
551 New Jersey 201/551
552
553
554
555* reserved/fictitious
556
557 Missouri 314/557
559 California
560
561 Florida
562 California
563 Iowa
564 Washington 564/360 (proposed)
565
566
567 Ohio 419/567
568 Ontario
569
570 Pennsylvania 570/272
571 Virginia 703/571
572
573 Missouri
574 Indiana
575 New Mexico
576
577
578
579 Quebec 450/579
580 Oklahoma
581 Quebec 418/581
582
583
584
585 New York
586 Michigan
587 Alberta 403/587; 780/587
588
589
590
591
592
593
594
595
596
597
598
599


NPA Region Overlay
600! Tandem (AT&T?) [1]
Canada (reserved)
^ AUTOVON
601 Mississippi 601/769
602 Arizona
603 New Hampshire
604 British Columbia 604/778
605 South Dakota
606 Kentucky
607 New York
608 Wisconsin
609 New Jersey
610 Pennsylvania 610/484
611~
612 Minnesota
613 Ontario 613/343
Quebec
614 Ohio 614/380
615 Tennessee
616 Michigan
617 Massachusetts 617/857
618 Illinois 618/730
619 California
620 Kansas
621
622 Canada (reserved)
623 Arizona
624
625
626 California
627 California
628 California
629
630 Illinois 630/331
631 New York 631/934
632
633 Canada (reserved)
634
635
636 Missouri
637
638
639 Saskatchewan
640
641 Iowa
642
643
644 Canada (reserved)
645
646 New York 212/646/917
647 Ontario 416/647
648
649$ Turks and Caicos
650 California 650/764
651 Minnesota
652
653
654
655 Canada (reserved)
656
657 California 714/657
658$ Jamaica
659 Alabama 205/659
660 Missouri
661 California
662 Mississippi
664$ Montserrat
665
666& Hell
667 Maryland 410/443/667
668
669 California 408/669
670$ Northern Mariana Islands
671 Guam
672
673
674
675
676
677 Canada (reserved)
678 Georgia 404/678/470; 770/678/470
679 Michigan
680
681 West Virginia 304/681
682 Texas 817/682
683
684 American Samoa
Hawai'i 684/808 (proposed)
685
686
687
688 Canada (reserved)
689 Florida 407/689
690
691
692
693
694
695
696
697
698
699

[1] http://binrev.com/forums/index.php/topic/45525-understanding-the-tandem-netw
ork/!entry361501


NPA Region Overlay
700% WATS
701 North Dakota
702 Nevada
703 Virginia 703/571
704 North Carolina 704/980
705 Ontario 705/249
706 Georgia 706/762
707 California
708 Illinois 708/464
709 Newfoundland
Labrador
710 U.S. government (+1 710 NCS-GETS)
711~ TTY/voice relay N11 (nationwide but administered on the state level)
712 Iowa
713 Texas 713/281/832
714 California 714/657
715 Wisconsin 715/534
716 New York
717 Pennsylvania
718 New York 718/347/917/929
719 Colorado
720 Colorado 303/720
721$ Sint Maarten
722
723
724 Pennsylvania 724/878
725 Nevada 725/702/777
726
727 Florida
728
729
730 Illinois 618/730
731 Tennessee
732 New Jersey 732/848
733
734 Michigan
735
736
737 Texas 512/737
738
739
740 Ohio
741
742
743
744
745
746
747 California 818/747
748
749
750% WATS (personal)
751
752
753
754 Florida 954/754
755% WATS
756
757 Virginia
758$ St Lucia
759
760 California 760/442
761
762 Georgia 706/762
763 Minnesota
764 California 650/764
765 Indiana
766
767$ Dominican Republic
768
769 Mississippi 601/769
770 Georgia 770/678/470
771
772 Florida
773 Illinois 773/872
774 Massachusetts 508/774
775 Nevada
776
777# Nevada (proposed) 777/702/725
778 British Columbia 250/778; 604/778
779 Illinois 815/779
780 Alberta 780/587
781 Massachusetts 781/339
782
783
784$ St Vincent
Grenadine Islands
785 Kansas
786 Florida 305/786
787 Puerto Rico 787/939
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799



NPA Region Overlay
800 WATS (toll-free)
801 Utah 801/385
802 Vermont
803 South Carolina
804 Virginia
805 California
806 Texas
807 Ontario
808 Hawaii 808/684 (proposed)
809$ Dominican Republic 809/829/849
810 Michigan
811~
812 Indiana
813 Florida
814 Pennsylvania
815 Illinois 815/779
816 Missouri 816/975
817 Texas 817/682
818 California 818/747
819 Quebec 819/873
820 WATS (reserved)
821 WATS (reserved)
822# WATS (toll-free)
823 WATS (reserved)
824 WATS (reserved)
825 Alberta
826
827
828 North Carolina
829$ Dominican Republic 809/829/849
830 Texas
831 California
832 Texas 713/281/832
833# WATS (toll-free)
834 WATS (reserved)
835 WATS (reserved)
836 WATS (reserved)
837 WATS (reserved)
838 WATS (reserved)
839 WATS (reserved)
840
841
842
843 South Carolina
844# WATS (toll-free)
845 New York
846
847 Illinois 847/224
848 New Jersey 732/848
849$ Dominican Republic 809/829/849
850 Florida
851 WATS (intrastate)
852 WATS (intrastate)
853 WATS (intrastate)
854 WATS (intrastate)
855# WATS (intrastate)
856 New Jersey
857 Massachusetts 617/857
858 California
859 Kentucky
860 Connecticut 860/959
861
862 New Jersey 973/862
863 Florida
864 South Carolina
865 Tennessee
866 WATS (toll-free)
867 Northwest Territories
Nunavut
Yukon
868$ Trinidad and Tobago
869$ St Kitts and Nevis
870 Arkansas 870/327
871 Quebec
872 Illinois 312/872; 773/872
873 Quebec 819/873
874
875
876$ Jamaica
877 WATS (toll-free)
878 Pennsylvania 412/878; 724/878
879 Newfoundland
Labrador
880# WATS (toll-free)
881# WATS (toll-free)
882# WATS (toll-free)
883# WATS (toll-free)
884# WATS (toll-free)
885# WATS (toll-free)
886^ Toll stations
887# WATS (toll-free)
888 WATS (toll-free)
889^ Toll stations
890
891
892
893
894
895
896
897
898
899* Mexico



NPA Region Overlay
900 WATS (toll)
901 Tennessee
902 Nova Scotia
Prince Edward Island
903 Texas 903/430
904 Florida
905 Ontario 905/289/365
906 Michigan
907 Alaska
908 New Jersey
909 California
910 North Carolina
911~ Critical emergency N11 (nationwide)
912 Georgia
913 Kansas
914 New York
915 Texas
916 California
917 New York 212/646/917; 718/347/917/929
918 Oklahoma 918/539
919 North Carolina 919/984
920 Wisconsin 920/274
921
922
923
924
925 California
926
927
928 Arizona
929 New York
930
931 Tennessee
932
933
934 New York 934/631
935 California
936 Texas
937 Ohio
938 Alabama 256/938
939 Puerto Rico 787/939
940 Texas
941 Florida
942 Nova Scotia
943
944
945
946
947 Michigan
948
949 California
950 Competitive long-distance access (FGB) - not an NPA code
951 California
952 Minnesota
953
954 Florida 954/754
955 WATS (toll)
956 Texas
957
958 Tennessee
959 Connecticut 860/959
960 WATS (toll)
961 WATS (toll)
962 WATS (toll)
963 WATS (toll)
964 WATS (toll)
965 WATS (toll)
966 WATS (toll)
967 WATS (toll)
968 WATS (toll)
969 WATS (toll)
970 Colorado
971 Oregon 971/503
972 Texas 214/469/972
973 New Jersey 973/862
974
975 Missouri 816/975
976@ WATS (local toll) - not an NPA code
977 WATS (toll)
978 Massachusetts 978/351
979 Texas
980 North Carolina 704/980
981
982
983
984 North Carolina 919/984
985 Louisiana
986
987
988
989 Michigan
990
991
992
993
994
995
996
997
998
999! WATS (telco)
0

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The pre-1995 NPA list.

http://mistman.pdp10.org/pub/phone/npa-list-pre95.txt


Pre-1995 NANP numbering plan area list


NPA Region
200
201 New Jersey
202 District of Columbia
203 Connecticut
204 Manitoba
205 Alabama
206 Washington (western)
207 Maine
208 Idaho
209
210 Texas (San Antonio)
212 New York (New York City)
213 California (Southern California, including Los Angeles)
214 Texas (northeastern Texas, including Dallas/Fort Worth)
215 Pennsylvania (southeastern Pennsylvania, including Philadelphia)
216 Ohio (northeastern Ohio, including Cleveland)
217 Illinois (central)
218 Minnesota (except southeastern part of state)
219

300
301 Maryland
302 Delaware
303 Colorado
304 West Virginia
305 Florida
306 Saskatchewan
307 Wyoming
308
309
310
312 Illinois (Chicago metropolitan area)
313 Michigan (southeast Michigan, including Detroit)
314 Missouri (eastern Missouri, including St. Louis)
315 New York (central upstate New York, including Syracuse)
316 Kansas (southern half of Kansas)
317 Indiana (northern 2/3rds of Indiana, including Indianapolis)
318
319 Iowa (eastern 1/3 of Iowa)

400
401 Rhode Island
402 Nebraska
403 Alberta
404 Georgia (Atlanta)
405 Oklahoma
406 Montana
407
408
409
410 Maryland (eastern)
412 Pennsylvania
413 Massachusetts
414 Wisconsin
415 California
416 Ontario (southern part of province, including Toronto)
417
418 Quebec (eastern half of Quebec)
419 Ohio

500
501 Arkansas
502 Kentucky
503 Oregon
504 Louisiana
505 New Mexico
506
507
508
509 Washington (eastern)
510 TWX
512 Texas
513 Ohio
514 Quebec (western half of Quebec)
515 Iowa
516
517 Michigan
518 New York
519

600 AutoVoN (U.S. military/government)
601 Mississippi
602 Arizona
603 New Hampshire
604 British Columbia
605 South Dakota
606
607
608
609
610 TWX
612 Minnesota
613 Ontario (excluding southern part of province)
614 Ohio
615
616 Michigan
617 Massachusetts
618 Illinois
619

700 WATS
701 North Dakota
702 Nevada
703 Virginia
704 North Carolina
705
706 Georgia; northern Mexico (until 1991)
707
708
709
710 TWX
712 Iowa
713 Texas
714
715 Wisconsin
716 New York
717 Pennsylvania
718 New York (New York City)
719

800 WATS (toll-free)
801 Utah
802 Vermont
803 South Carolina
804
805 American Samoa
806 Guam
807
808 Hawai'i
809 Bermuda, Puerto Rico, U.S. Virgin Islands,
810 TWX
812 Indiana
813
814 Pennsylvania
815 Illinois
816 Missouri
817
818
819

900 WATS (toll)
901 Tennessee
902 Nova Scotia, Prince Edward Island, New Brunswick
903 Texas (northeastern); northern Mexico (until 1991)
904
905 Ontario (Greater Toronto area); Mexico City, F.D., Mexico (until 1991)
906
907
908
909
910 TWX
912
913 Kansas
914 New York
915 Texas
916 California
917
918
919
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Another pre-1994 list. Not from Mistman but included for comparison and has lots of explanatory information.

http://textfiles.com/phreak/guide.npa


Received: from wumpus.brl.mil by MINTAKA.LCS.MIT.EDU id aa20654;
7 Jan 94 19:07 EST
Received: by WUMPUS.BRL.MIL id aa26172; 7 Jan 94 19:00 EST
Date: Fri, 7 Jan 94 19:00:01 EST
From: cmoore@brl.mil
Subject: guide
To: telecom-request@eecs.nwu.edu, telecom-recent@LCS.MIT.EDU
Message-ID:

TELECOM Digest Guide to
North American Area Codes
=========================
November 4, 1991

** Revised version as of 7 January 1994 **

FIRST, PLEASE TAKE NOTE THAT the information appearing herein has been
placed in the public domain. It can be copied and distributed freely.
While prepared for, and intended as a service to the USENET community,
anyone is free to copy it and use/distribute it. Please credit TELECOM
Digest, and our correspondents named herein in any republication.

This guide is in several parts:

1) Numerical listing of area codes; major cities served by each or
state name, where area code serves entire state or province.

2) Listing and discussion of SAC's (Special Area Codes) which do
not relate to the voice telephone network or do relate to the
voice network but have no specific geographical region assigned.

3) Numerical listing of prefixes in 'area code' 800 (the code used
for In-WATS 'toll-free' calling) and telephone carrier which is
assigned to each.

4) Numerical listing of prefixes in 'area code' 900 (the code used
for value added information services) and the telephone company
or IP (Information Provider) which operates each group of lines.

5) A translation table for the names of the companies involved.

6) A technical discussion of the processing of 700/800/900 calls.

7) A glossary of technical terms used throughout the guide.

To ascertain the name of a community assigned to any particular prefix
other than 700/800/900 -- that is to say, a 'regular' area code, simply
dial the AT&T Operator at 10288-0 (or simply '00' if AT&T is your default
long distance carrier. Ask the operator for the 'name-place' of the area
code and prefix in question. There is no charge for this service.

The persons named at the start of each item in the guide are responsible
for the accuracy of the contents therein. We hope this guide to area codes
in North America will be useful information for Usenetters using the phone.

============================================================================

To: comp-dcom-telecom@rutgers.edu
From: dupuy@cs.columbia.edu (Alexander Dupuy)
Subject: Area Code Numerical Listings
Date: 13 Jan 89 22:11:51 GMT

You don't need a C program to translate area codes into placenames: this script
does the trick just as well, and it's easy to modify when they change:

@alex [ revised Nov. 4, 1991 and later by Carl Moore ]
==============================================================================
#!/bin/sh
'exec' /usr/bin/look "$1" "$0"
011 [ International Access Code ]
200 [ Reserved - Service Access Code ]
201 Morristown, Newark and Jersey City, (Northeast) New Jersey
202 Washington, District of Columbia
203 All parts of Connecticut
204 All parts of Manitoba, CANADA
205 All parts of Alabama
206 Seattle, Tacoma and Vancouver, (Western) Washington
207 All parts of Maine
208 All parts of Idaho
209 Fresno and Stockton, (Central) California
210 San Antonio, (Southern) Texas
211 [ Coin-operated Telephone Refunds ]
212 New York City (Manhattan only), New York
213 Los Angeles, California
214 Dallas, (Northeast) Texas
215 Philadelphia and Quakertown, (Southeast) Pennsylvania
216 Akron, Cleveland, Massillon and Youngstown, (Northeast) Ohio
217 Springfield and Champaign-Urbana, (South Central) Illinois
218 Duluth, (Northern) Minnesota
219 Gary, Hammond, Fort Wayne and South Bend, (Northern) Indiana
300 [ Reserved - Service Access Code ]
301 Silver Spring and Frederick, (Southern and Western) Maryland
302 All parts of Delaware
303 Boulder, Denver and Grand Junction, (Northern and Western) Colorado
304 All parts of West Virginia
305 Fort Lauderdale, Key West and Miami, (Southeast) Florida
306 All parts of Saskatchewan, CANADA
307 All parts of Wyoming
308 North Platte and Grand Island, (Western) Nebraska
309 Moline, Rock Island and Peoria, (West Central) Illinois
310 Parts of Los Angeles, California
311 [ Reserved - Special Function ]
312 Chicago, Illinois
313 Detroit and Ann Arbor, (Eastern) Michigan
314 Saint Louis and Columbia, (Eastern) Missouri
315 Oswego, Syracuse and Utica, (North Central) New York
316 Dodge City and Wichita, (Southern) Kansas
317 Indianapolis and Kokomo, (Central) Indiana
318 Lake Charles and Shreveport, (Western) Louisiana
319 Dubuque, Cedar Rapids and Iowa City, (Eastern) Iowa
400 [ Reserved - Service Access Code ]
401 All parts of Rhode Island
402 Lincoln and Omaha, (Eastern) Nebraska
403 Alberta, Yukon Territory and (Western) Northwest Territories, CANADA
404 Atlanta, (Northern) Georgia
405 Oklahoma City, (Southern and Western) Oklahoma
406 All parts of Montana
407 Orlando, West Palm Beach, (Eastern) Florida
408 San Jose and Sunnyvale, (Central Coastal/Silicon Valley) California
409 Galveston and Port Arthur, (Southeast) Texas
410 Baltimore and Annapolis, (Eastern) Maryland
411 [ Local Directory Assistance ]
412 Pittsburgh and New Castle, (Western) Pennsylvania
413 Springfield and Pittsfield, (Western) Massachusetts
414 Green Bay, Milwaukee and Racine, (Eastern) Wisconsin
415 San Francisco, (West Bay Area) California
416 Toronto, (South Central) Ontario, CANADA
417 Joplin and Springfield, (Southwest) Missouri
418 Quebec City, (Northeast) Quebec, CANADA
419 Toledo and Lima, (Northwest) Ohio
500 [ Reserved - Service Access Code ]
501 All parts of Arkansas
502 Louisville and Paducah, (Western) Kentucky
503 All parts of Oregon
504 Baton Rouge and New Orleans, (Eastern) Louisiana
505 All parts of New Mexico
506 All parts of New Brunswick, CANADA
507 Rochester, Austin and Winona, (Southern) Minnesota
508 Worcester, Framingham and New Bedford, (Eastern) Massachusetts
509 Spokane and Walla Walla, (Eastern) Washington
510 Oakland, (East Bay Area) California
511 [ Reserved - Special Function ]
512 Austin and Corpus Christi, (Southern) Texas
513 Cincinnati and Dayton, (Southwest) Ohio
514 Montreal, (Southern) Quebec, CANADA
515 Des Moines and Fort Dodge, (Central) Iowa
516 Hempstead, (Long Island) New York
517 Lansing and Saginaw, (Central) Michigan
518 Albany and Schenectady, (Northeast) New York
519 London, (Southwest) Ontario, CANADA
600 [ Reserved - Service Access Code ]
601 All parts of Mississippi
602 All parts of Arizona
603 All parts of New Hampshire
604 All parts of British Columbia, CANADA
605 All parts of South Dakota
606 Ashland and Covington, (Eastern) Kentucky
607 Binghamton, Elmira and Ithaca, (South Central) New York
608 Beloit and Madison, (Southwest) Wisconsin
609 Atlantic City, Camden and Trenton, (Southern) New Jersey
610 [Telex II (TWX) Service for CANADA]
610 Allentown, Reading and Chester, (Southeast) Pennsylvania
611 [ Repair Service ]
612 Minneapolis and Saint Paul, (Central) Minnesota
613 Ottawa, (Southeast) Ontario, CANADA
614 Columbus and Zanesville, (Southeast) Ohio
615 Chattanooga and Nashville, (Eastern) Tennessee
616 Battle Creek and Grand Rapids, (Western) Michigan
617 Boston and surrounding area, (Eastern) Massachusetts
618 Alton and Centralia, (Southern) Illinois
619 San Diego, Palm Springs and the Imperial Valley, California
700 Value Added Information Service Access Code (varies by LD carrier)
701 All parts of North Dakota
702 All parts of Nevada
703 Arlington and Roanoke, (Northern and Western) Virginia
704 Charlotte and Salisbury, (Western) North Carolina
705 North Bay, (Northern) Ontario, CANADA
706 [Formerly Tijuana, (Northwest) MEXICO equivalent to +52 6X XXX XXX]
706 Augusta, Columbus and Rome, (Northern) Georgia
707 Eureka, Napa and Santa Rosa, (North Coastal) California
708 Aurora, Elgin, Evanston and Waukegan, (Northeast) Illinois
709 All parts of Newfoundland and Labrador, CANADA
710 [ Government Special Services ]
711 [ Reserved - Special Function ]
712 Council Bluffs and Sioux City, (Western) Iowa
713 Houston and surrounding area, Texas
714 Orange County, California
715 Eau Claire and Wausau, (Northern) Wisconsin
716 Buffalo, Niagara Falls and Rochester, (Western) New York
717 Harrisburg, Pottsville and Scranton, (East Central) Pennsylvania
718 New York City (Bronx, Brooklyn, Queens, Staten Island), New York
719 Colorado Springs and Pueblo, (Southeast) Colorado
800 "Toll-Free" Incoming WATS Service Access Code
801 All parts of Utah
802 All parts of Vermont
803 All parts of South Carolina
804 Charlottesville, Norfolk and Richmond, (Southeast) Virginia
805 Bakersfield, Ventura and Simi Valley, (South Central) California
806 Amarillo, (North Panhandle) Texas
807 Thunder Bay and Fort William, (Northwest) Ontario, CANADA
808 All parts of Hawaii
809 Bahamas, Bermuda, Puerto Rico, the Virgin Islands, etc.
810 Flint and Pontiac, (Eastern) Michigan
811 [ Reserved - Special Function ]
812 Bloomington, Evansville and Terre Haute, (Southern) Indiana
813 Fort Myers, St. Petersburg and Tampa, (Southwest) Florida
814 Altoona and Erie, (West Central) Pennsylvania
815 Freeport, Joliet and Rockford, (Northern) Illinois
816 Kansas City and Saint Joseph, (Northwest) Missouri
817 Fort Worth, Temple and Waco, (North Central) Texas
818 Pasadena and San Fernando (area north of Los Angeles), California
819 Hull and Sherbrooke, (Western) Quebec and (Eastern) NW Territories, CANADA
900 Mass Calling and Value Added Information Service Access Code
901 Memphis and Jackson, (Western) Tennessee
902 All parts of Prince Edward Island and Nova Scotia, CANADA
903 Texarkana and Paris, (Northeast) Texas
904 Jacksonville and Pensacola, (Northern) Florida
905 [Formerly Mexico City, (Northern) MEXICO equivalent to +52 5 XXX XXXX]
905 Hamilton and Niagara Falls, (South Central) Ontario, CANADA
906 Sault Ste. Marie and Marquette, (Upper North) Michigan
907 All parts of Alaska
908 Elizabeth and New Brunswick, (Central) New Jersey
909 [ was Telenet Communications Data Network ]
909 Riverside and San Bernardino, (Southern) California
910 Winston-Salem, Greensboro and Fayetteville, (Central) North Carolina
911 [ Police/Fire Emergency Service ]
912 Macon and Savannah, (Southern) Georgia
913 Salina and Topeka, (Northern) Kansas
914 New Rochelle, White Plains and Poughkeepsie, (Southern) New York
915 Abilene, El Paso and Odessa, (Western) Texas
916 Sacramento and Davis, (Northern) California
917 Cellular and Paging for New York City
918 Muskogee and Tulsa, (Northeast) Oklahoma
919 Greenville, Raleigh and Williamston, (Eastern) North Carolina
--
inet: dupuy@columbia.edu
uucp: ...!rutgers!columbia!dupuy

------------------------------

Date: Sun, 15 Jan 89 10:39:19 EST
From: telecom@bu-cs.BU.EDU (TELECOM Moderator)
To: Telecom@bu-cs.bu.edu
Subject: Supplementary Code Numbers

You may wish to add a few additional codes to the list given above. These three
digit codes are also in use, although they are not, strictly speaking, 'area
codes'. They are not in the chart above since I thought some of you may not
want them there. If you do, then edit them in.

[Some of the following information became obsolete, because
410,510,610,810,910 became geographic area codes.]

200 Local testing, used by many telcos.
410 Western Union Telegraph Company - Northeast USA
510 Western Union Telegraph Company - Eastern USA
610 Western Union Telegraph Company - Canada
700 Value Added Information Services, per individual OCC
710 Western Union Telegraph Company - Southern USA
800 In-WATS 'toll free' calling
810 Western Union Telegraph Company - Mexico
900 Mass Calling Information/Value Added Services
910 Western Union Telegraph Company - Western USA (from Chicago westward)

The thing with WUTCO is, many years ago the old Bell System operated Teletype
machines; what they called the TWX (or [T]ype[W]riter E[X]change. The TWX
machines had their own switches, located in existing telephone central
offices, but on separate equipment. About twenty years ago, a court ruling
required Bell to sell its TWX service to Western Union, in a suit brought by
WUTCO against AT&T. WUTCO operated the system as TWX for many years, and in
the past five years has changed the name to Telex II. The Western Union
central offices for Telex I (the original telex network) have always been
in WUTCO offices. The central offices for Telex II (formerly AT&T's TWX) are
still in Bell central offices, although they now belong to WUTCO. Is that
clear? You cannot dial into those numbers.

The WUTCO codes more or less match certain areas of the country, but in
recent years they have been more randomly assigned. If you see a number which
looks like a phone number, but has one of those leading codes, it is actually
a TWX machine.

When the present unassigned area codes of the conventional format have all
been used, sometime around 1992-1995, area codes 210,211,310,311,400,500,511,
600,711 and 811 will be next in line for assignment.

[Note as of 1993, 210 and 310 in use.]

Whether or not you want to include these special numbers in the chart given
in the earlier message depends on if you want strictly a listing of the
*dialable* codes used by the voice network at present, or if you want to
include all *assigned* codes. And while 700-800-900 are not strictly
speaking area codes, my belief is they definitely should be added to the list.

==========================================================================

Date: Mon, 2 Jan 89 20:30:08 EST
From: scotts@bu-it.BU.EDU
To: telecom@bu-it.bu.edu
Subject: 800 Service

As some readers of this list may not know, under Equal Access,
any long-distance company can carry 1-800 traffic. Which carrier gets
the call is determined (at the moment) by the NNX of the number. I.E.
1-800-528-1234 (The nation-wide number for making reservations at a
Best Western Motel) is carried by AT&T. While 1-800-888-1800 is
carried by MCI.

The carrier must have Feature Group D presence for originating
calls from the originating exchange (either direct, or through an
access tandem).

In the future, when CCIS becomes wide-spread, a query will be
made in the database [Who gets 1-800-985-1234?] and the call will be
routed appropriately. To clarify: Now the carrier is determined by
the NNX. In the future, the carrier will be determined by the entire
7 digits.

A similar situation exists with 900 service. Each carrier can
reserve NXX-s from BellCore (the people who among a zillion other
tasks are in charge of handing out prefixes and area codes). They're
not cheap! To get the actual number is free (there are qualifications
that I don't deal with), but to get it 'turned on' in a LATA costs you
money, depending on (1) How many prefixes you're getting, (2) whether
it's 800 or 900 service, (3) How many Tandems/End Offices are in the
LATA. It requires a discrete amount of labor for EACH office, because
EACH routing table must be modified.

Of the 800 possible NXX-s, 409 are currently assigned. A
long-distance carrier can get one 800 and four 900 numbers just for
the paperwork. But to get more than that, you have to show that
you're 70% full now, and demonstrate a real need for the capacity.

I have included the entire 800-NXX to long-distance carrier
translation table. Note that not every NXX is valid in every area.

Revised 800/OCN Translation Table
Effective 10 October 1988

221 ATX 222 ATX 223 ATX 224 LDL 225 ATX
226 MIC 227 ATX 228 ATX 229 TDX 230 NTK
231 ATX 232 ATX 233 ATX 234 MCI 235 ATX
236 SCH 237 ATX 238 ATX 239 DLT 240 SIR
241 ATX 242 ATX 243 ATX 244 --- 245 ATX
246 --- 247 ATX 248 ATX 249 --- 250 ---
251 ATX 252 ATX 253 ATX 254 TTU 255 ATX
256 LSI 257 ATX 258 ATX 259 --- 260 ---
261 SCH 262 ATX 263 CAN 264 ICT 265 CAN
266 CSY 267 CAN 268 CAN 269 FDG 270 ---
271 --- 272 ATX 273 --- 274 MCI 275 ITT
276 ONE 277 SNT 278 --- 279 MAL 280 ADG
281 --- 282 ATX 283 MCI 284 MCI 285 ---
286 --- 287 --- 288 MCI 289 MCI 290 ---
291 --- 292 ATX 293 PRO 294 --- 295 ---
296 --- 297 ARE 298 --- 299 CYT

321 ATX 322 ATX 323 ATX 324 HNI 325 ATX
326 UTC 327 ATX 328 ATX 329 TET 330 TET
331 ATX 332 ATX 333 MCI 334 ATX 335 SCH
336 ATX 337 FST 338 ATX 339 --- 340 ---
341 ATX 342 ATX 343 ATX 344 ATX 345 ATX
346 ATX 347 UTC 348 ATX 349 DCT 350 CSY
351 ATX 352 ATX 353 --- 354 --- 355 ---
356 ATX 357 --- 358 ATX 359 UTC 360 ---
361 CAN 362 ATX 363 CAN 364 HNI 365 MCI
366 UTC 367 ATX 368 ATX 369 TDD 370 TDD
371 --- 372 ATX 373 TDD 374 --- 375 TNO
376 --- 377 GTS 378 --- 379 --- 380 ---
381 --- 382 ATX 383 TDD 384 FDT 385 CAB
386 TBQ 387 CAN 388 --- 389 --- 390 ---
391 --- 392 ATX 393 EXF 394 --- 395 ---
396 --- 397 TDD 398 --- 399 ARZ

421 ATX 422 ATX 423 ATX 424 ATX 425 TTH
426 ATX 427 --- 428 ATX 429 --- 430 ---
431 ATX 432 ATX 433 ATX 434 AGN 435 ATX
436 IDN 437 ATX 438 ATX 439 --- 440 TXN
441 ATX 442 ATX 443 ATX 444 MCI 445 ATX
446 ATX 447 ATX 448 ATX 449 --- 450 USL
451 ATX 452 ATX 453 ATX 454 ALN 455 ---
456 MCI 457 ATX 458 ATX 459 --- 460 ---
461 CAN 462 ATX 463 CAN 464 --- 465 CAN
466 ALN 467 ICT 468 ATX 469 --- 470 ---
471 ALN 472 ATX 473 --- 474 --- 475 TDD
476 TDD 477 --- 478 AAM 479 --- 480 ---
481 --- 482 ATX 483 --- 484 TDD 485 TDD
486 TDX 487 --- 488 --- 489 TOM 490 ---
491 --- 492 ATX 493 --- 494 --- 495 ---
496 --- 497 --- 498 --- 499 ---

521 ATX 522 ATX 523 ATX 524 ATX 525 ATX
526 ATX 527 ATX 528 ATX 529 MIT 530 ---
531 ATX 532 ATX 533 ATX 534 --- 535 ATX
536 ALN 537 ATX 538 ATX 539 --- 540 ---
541 ATX 542 ATX 543 ATX 544 ATX 545 ATX
546 UTC 547 ATX 548 ATX 549 --- 550 CMA
551 ATX 552 ATX 553 ATX 554 ATX 555 ATX
556 ATX 557 ALN 558 ATX 559 --- 560 ---
561 CAN 562 ATX 563 CAN 564 --- 565 CAN
566 ALN 567 CAN 568 --- 569 --- 570 ---
571 --- 572 ATX 573 --- 574 AMM 575 ---
576 --- 577 GTS 578 --- 579 LNS 580 WES
581 --- 582 ATX 583 TDD 584 TDD 585 ---
586 ATC 587 LTQ 588 ATC 589 LGT 590 ---
591 --- 592 ATX 593 TDD 594 TDD 595 ---
596 --- 597 --- 598 --- 599 ---

621 ATX 622 ATX 623 --- 624 ATX 625 NLD
626 ATX 627 MCI 628 ATX 629 --- 630 ---
631 ATX 632 ATX 633 ATX 634 ATX 635 ATX
636 CQU 637 ATX 638 ATX 639 BUR 640 ---
641 ATX 642 ATX 643 ATX 644 CMA 645 ATX
646 --- 647 ATX 648 ATX 649 --- 650 ---
651 --- 652 ATX 653 --- 654 ATX 655 ---
656 --- 657 TDD 658 TDD 659 --- 660 ---
661 CAN 662 ATX 663 CAN 664 UTC 665 CAN
666 MCI 667 CAN 668 CAN 669 UTC 670 ---
671 --- 672 ATX 673 TDD 674 TDD 675 ---
676 --- 677 --- 678 MCI 679 --- 680 ---
681 --- 682 ATX 683 MTD 684 --- 685 ---
686 LGT 687 NTS 688 --- 689 --- 690 ---
691 --- 692 ATX 693 --- 694 --- 695 ---
696 --- 697 --- 698 NYC 699 PLG

720 TGN
721 --- 722 ATX 723 --- 724 RTC 725 SAN
726 UTC 727 MCI 728 TDD 729 UTC 730 ---
731 --- 732 ATX 733 UTC 734 --- 735 UTC
736 UTC 737 MEC 738 MEC 739 --- 740 ---
741 MIC 742 ATX 743 EDS 744 --- 745 ---
746 --- 747 TDD 748 TDD 749 TDD 750 ---
751 --- 752 ATX 753 --- 754 TSH 755 ---
756 --- 757 TID 758 --- 759 MCI 760 ---
761 --- 762 ATX 763 --- 764 AAM 765 ---
766 --- 767 UTC 768 SNT 769 --- 770 GCN
771 SNT 772 ATX 773 CUX 774 --- 775 ---
776 UTC 777 MCI 778 UTC 779 TDD 780 TDD
781 --- 782 ATX 783 ALN 784 ALG 785 SNH
786 *1 787 --- 788 --- 789 TMU 790 ---
791 --- 792 ATX 793 --- 794 --- 795 ---
796 --- 797 TID 798 TDD 799 --

821 ATX 822 ATX 823 THA 824 ATX 825 MCI
826 ATX 827 UTC 828 ATX 829 UTC 830 ---
831 ATX 832 ATX 833 ATX 834 --- 835 ATX
836 TDD 837 TDD 838 --- 839 VST 840 ---
841 ATX 842 ATX 843 ATX 844 LDD 845 ATX
846 --- 847 ATX 848 ATX 849 --- 850 TKC
851 ATX 852 ATX 853 --- 854 ATX 855 ATX
856 --- 857 TLS 858 ATX 859 --- 860 ---
861 --- 862 ATX 863 ALN 864 TEN 865 ---
866 --- 867 --- 868 SNT 869 UTC 870 ---
871 --- 872 ATX 873 MCI 874 ATX 875 ALN
876 MCI 877 UTC 878 ALN 879 --- 880 NAS
881 NAS 882 ATX 883 --- 884 --- 885 ATX
886 ALN 887 ETS 888 MCI 889 --- 890 ---
891 --- 892 ATX 893 --- 894 --- 895 ---
896 TXN 897 --- 898 CGI 899 TDX

921 --- 922 ATX 923 ALN 924 --- 925 ---
926 --- 927 --- 928 CIS 929 --- 930 ---
931 --- 932 ATX 933 --- 934 --- 935 ---
936 RBW 937 MCI 938 --- 939 --- 940 TSF
941 --- 942 ATX 943 --- 944 --- 945 ---
946 --- 947 --- 948 --- 949 --- 950 MCI
951 BML 952 ATX 953 --- 954 --- 955 MCI
956 --- 957 --- 958 *2 959 *2 960 CNO
961 --- 962 ATX 963 SOC 964 --- 965 ---
966 TDX 967 --- 968 TED 969 TDX 970 ---
971 --- 972 ATX 973 --- 974 --- 975 ---
976 --- 977 --- 978 --- 979 --- 980 ---
981 --- 982 ATX 983 WUT 984 --- 985 ---
986 WUT 987 --- 988 WUT 989 TDX 990 ---
991 --- 992 ATX 993 --- 994 --- 995 ---
996 VOA 997 --- 998 --- 999 MCI

NOTES:
*1 -- RELEASED FOR FUTURE ASSIGNMENT
*2 -- These NXX codes are generally reserved for test applications; They
may be reserved for Access Tandem testing from an End Office.

Note also: The following NXX are dedicated for RCCP (Radio Common Carrier
Paging) under the discretion of the local exchange carrier:

202, 212, 302, 312, 402, 412, 502, 512, 602, 612, 702, 712, 802, 812, 902,
and 912.

===================================================

900 Series Prefix to OCN translation table

Please note that this differs from the 800 table, because much
fewer of the 900 NXXs are assigned.

NXX OCN NXX OCN NXX OCN NXX OCN NXX OCN
200 ATX 202 Ameritech 210 ATX 220 ATX 221 TDX
222 ONC 223 TDX 225 Pac. Bell 226 MCI 233 TDX
234 TEN 240 U.S. West 248 Ameritech 250 ATX 258 TEN
254 TTU 255 SNT 260 ATX 264 ADG 266 CSY
272 Bell Atl. 273 CAN 275 ITT 280 Ameritech 282 LGT
283 Pac. Bell 288 GTE N.west 297 CAN 300 ATX 301 Ameritech
302 Ameritech 303 Pac. Bell 321 TEN 322 TDX 327 ETS
328 ATX 331 TET 332 PLG 333 U.S. West 335 Bell Atl.
342 ATX 344 ATX 345 ALN 346 United Tel. 350 ATX
364 GTE N.west 366 ONC 369 TEN 370 ATX 377 GTS
386 United Tel. 388 SNT 399 ARZ 400 ATX 407 ATX
410 ATX 420 ATX 422 ALN 426 PLG 428 Ameritech
430 U.S. West 444 ONC 445 PHE 446 MCI 450 Ameritech
451 CAN 456 TEN 463 United Tel. 478 AAM 479 ARZ
480 ATX 483 GTE Midwest 488 ONC 490 U.S. West 500 ATX
505 Pac. Bell 520 ATX 529 MIT 536 BUR 540 ALN
543 ALN 545 GTE Calif. 550 ALN 555 ATX 567 ALN
580 U.S. West 590 ATX 595 CAN 600 ATX 620 Ameritech
624 Pac. Bell 626 CSY 628 Ameritech 630 CAN 633 MIT
639 PLG 643 CAN 645 CAN 650 ATX 654 TEN
656 SNT 660 ATX 661 United Tel. 663 MDE 665 ALN
666 ONC 670 CAN 677 CAN 678 MCI 680 ATX
686 LTG 690 CAN 698 NY Tel. 699 PLG 701 Bell Atl.
710 TGN 720 ATX 722 Pac. Bell 724 RTC 725 SNT
727 GTE Calif. 730 ATX 739 CSY 740 ATX 741 TEN
746 ITT 750 CAN 753 ALN 765 ALN 773 ATX
777 Pac. Bell 778 Ameritech 780 Ameritech 786 ATX 790 CAN
792 CAN 801 Bell Atl. 820 ATX 830 CAN 843 Pac. Bell
844 Pac. Bell 847 United Tel. 850 ATX 860 ATX 866 AAM
870 CAN 872 TEN 887 ETS 888 CIS 900 TDX
901 Bell Atl. 903 ATX 909 ATX 924 Ameritech 932 ATX
948 ARZ 949 MIC 963 TEN 970 MIC 971 MIC
972 MIC 973 MIC 974 ALN 975 ALN 976 ATX
988 MCI 990 MCI 991 ALG 993 SNT 999 TEN

OCN Reference List:

ADG - Advantage Network, Inc. AGN - AMRIGON
ALG - Allnet Communication Services AMM - Access Long Distance
AAM - ALASCOM ARE - American Express TRS
ARZ - AmeriCall Corporation (Calif.) ATC - Action Telecom Co.
ATX - AT&T BML - Phone America
BUR - Burlington Tel. CAB - Hedges Communications
CAN - Telcom Canada CNO - COMTEL of New Orleans
CQU - ConQuest Comm. Corp CSY - COM Systems
CUX - Compu-Tel Inc. CYT - ClayDesta Communications
DCT - Direct Communications, Inc. DLT - Delta Communications, Inc.
EDS - Electronic Data Systems Corp. ETS - Eastern Telephone Systems, Inc.
EXF - Execulines of Florida, Inc. FDG - First Digital Network
FDN - Florida Digital Network FDT - Friend Technologies
FST - First Data Resources GCN - General Communications, Inc.
GTS - Telenet Comm. Corp. HNI - Houston Network, Inc.
ITT - United States Transmission System LDD - LDDS-II, Inc.
LDL - Long Distance for Less LGT - LITEL
LNS - Lintel Systems LSI - Long Distance Savers
LTQ - Long Distance for Less MAL - MIDAMERICAN
MCI - MCI Telecommunications Corp. MDE - Meade Associates
MEC - Mercury, Inc. MIC - Microtel, Inc.
MIT - Midco Communications MTD - Metromedia Long Distance
NLD - National Data Corp. NTK - Network Telemanagement Svcs.
NTS - NTS Communications ONC - OMNICALL, Inc.
ONE - One Call Communications, Inc. PHE - Phone Mail, Inc.
PLG - Pilgrim Telephone Co. PRO - PROTO-COL
RBW - R-Comm RTC - RCI Corporation
SAN - Satelco SCH - Schneider Communications
SDY - TELVUE Corp. SIR - Southern Interexchange Services
SLS - Southland Systems, Inc. SNH - Sunshine Telephone Co.
SNT - SouthernNet, Inc. SOC - State of California
TBQ - Telecable Corp. TDD - Teleconnect
TDX - Cable & Wireless Comm. TED - TeleDial America
TEM - Telesystems, Inc. TEN - Telesphere Network, Inc.
TET - Teltec Savings Communications Co. TGN - Telemanagement Consult't Corp.
THA - Touch America TID - TMC South Central Indiana
TKC - TK Communications, Inc. TLS - TELE-SAV
TMU - Tel-America, Inc. TNO - ATC Cignal Communications
TOM - TMC of Montgomery TOR - TMC of Orlando
TSF - SOUTH-TEL TSH - Tel-Share
TTH - Tele Tech, Inc. TTU - Total-Tel USA
TXN - Tex-Net USL - U.S. Link Long Distance
UTC - U.S. Telcom, Inc. (U.S. Sprint) VOA - Valu-Line
VST - STAR-LINE WES - Westel
WUT - Western Union Telegraph Co.

NOTE: Where local telcos, such as Illinois Bell offer 800 service, they
purchase blocks of numbers from AT&T on prefixes assigned to AT&T. They
are free to purchase blocks of numbers from any carrier of their choice
however.
============================================================================

Date: Tue, 3 Jan 89 01:57:48 EST
From: scotts@bu-it.BU.EDU
To: telecom@bu-cs.bu.edu
Subject: Another lesson on 700/800/900 service

I have compiled some more information about the SACs for your
edification.

These include 700, 800, and 900.

Most telephone users from the United States are quite familiar with
800 service: a number that they dial and incur NO charge (not even
message units in most [all?] areas).

Then there is 900 service, which is most people perceive as 'value
added', i.e. you pay more for the information than for the transport
of the call. These vary typically from 35 cents to a few dollars for
either a timed service, or a 'as long as you like' duration-sensitive
service. There are two sub-species of 900 service, AT&T and
"everybody else".

Finally there is 700 service, which many people remember as Alliance
Teleconferencing. This is the third "canonical" SAC. With few
limitations, this SAC is given over to the IEC entirely.

Let's look at these in more detail:

800 service is offered by various IECs. Each NXX in the 800 SAC is
assigned to a given carrier, who is responsible for assigning numbers
from that block to customers, and providing 10 digit translation.
When you as Joe Customer dial 1-800-222-1234 (made up number, please
don't bother them) it will initiate the following sequence:

1. If you are in an Electronic Office (DMS-100, DMS-200, 1A ESS, #5
ESS) the 800-222 will be translated to "AT&T" and search for an
opening in a trunk group marked for 800 origination. Should none be
found, bump to step 3.

2. If you are in a non-electronic office (SXS, XB, and some flavors
of ESS), it will go to the access tandem that your office 'homes'
on, where 800-222 will be translated to "AT&T".

[note that if at this point, the number doesn't have a translation,
you will get a "lose" recording from the CO]

3. Find a trunk in a trunk group marked for 800 origination. Should
none be found, give the customer a recording "Due to network
congestion, your 800 call could not be completed" or die, or whatever.
(Depends on phase of moon, etc.)

4. The end office will then send the following pulse-stream (in MF):

KP + II + 3/10D + ST + KP + 800 222 1234 + ST

(note that this is a simplification, there are some fine points of
ANI spills that are beyond the scope of this article)

II = 2 information digits ... typical values are:
00 normal ANI .. 10 digits follow
01 ONI line ... NPA follows
02 ANI failure ... NPA follows
3/10D = 3 or 10 digits. Either the NPA, or the entire 10
digit number.
KP and ST are control tones

5. The carrier receives all of this (and probably throws the ANI into
the bit bucket) and translates the 800 number to what's called a PTN,
or Plant Test Number. For Example, 617-555-9111. Then, the call is
routed AS IF the customer had dialed that 10 digit number. Of course,
the billing data is marked as an 800 call, so the subscriber receiving
th call pays the appropriate amount.

900 Service. As I mentioned earlier there are two flavors of 900
service, AT&T, and "Everybody Else". Everybody else is handled
exactly as 800 service above, except the IEC will probably use the ANI
information to send you a bill. (Either directly, or through your
BOC, each situation governed by applicable tariffs and contractual
arrangements between the IEC and the BOC)

AT&T 900 is a curious monster indeed. It was designed as a "mass
termination" service. When you dial a 900 # by AT&T (such as the
"hear space shuttle mission audio" number) you get routed to one of
twelve "nodes" strewn throughout the country. These nodes are each
capable of terminating 9,000 calls >PER SECOND<. there are several> options available, where the customer and/or the IP pay for all/part
of the call. The big difference between 800 and AT&T 900 is >NOT "who pays for the call" (there are free 900 numbers) but "how many
people can it handle at once". The IP is responsible for providing
program audio. AT&T is prohibited from providing audio-program
services (i.e. tape recorded messages) [As with any rule, there are
exceptions to these as well]

The last SAC we'll deal with is 700. I've seen ads on late-nite
television for Group Access Bridging service (GAB) under 700 numbers,
with a elephantine dialing sequence. The one that comes to mind is
10041-1-700-777-7777. [I make no guarantee about the quality or
availability of this service. I don't even know if it still exists.]
If you were to dial 1-700-555-4141 you will hear a recording
announcing your Equal-Access carrier. (Some carriers ignore the last
four digits, and any 700-555 number will give the announcement).

This is signalled the same as 800 service, and may or may not be
billed ENTIRELY at the discretion of the IEC. In New York, under PSC
tariff you can order 900 and/or 700 blocking as well as 976, 970, 550,
and 540 blocking in various (but not entirely orthogonal)
combinations.

What in ONE carrier might be a customer service hotline (Dial 1-700-I
AM LOST) might for another be a revenue product. There is LITTLE
standardization of 700 usage from IEC to IEC.

The one last dialing pattern that is worth mentioning is what's
called, "cut through dialing". Try dialing 10220#. If Western Union
comes to your town, you'll get a FG-A style dial tone. Presumably if
you had a Western Union "Calling Card" [I don't know their term for
it] you could dial a call. (If someone DOES have WU service, could
they please check this out for me?)

Glossary:

ANI - Automatic Number Identification. An MF sequence that identifies
your line for toll billing information. Often confused with ANAC
(Automatic Number Announcement Circuit) which reads your number back in
a synthesised voice.

BOC - Bell Operating Company. A often misused term (even in this very
article :-) that in general usage means, "Your local exchange
carrier." Since most of the telephones in the country are served by
what used to be the Bell system, we tend to use the term. The proper
term in this case, however IS "Exchange Carrier [EC]" They provide
service within your LATA.

FG-A - Feature Group A. Line Side termination for Long Distance
carriers. The old 555-1234 for Widget Telephone Company then dial an
access code and the number style dialing is called FG-A.

FG-B - Feature Group B. Trunk Side termination for Long Distance
carriers. (aka ENFIA B). 950 service. This is LATA wide service,
and doesn't cost the customer message units. ANI is only provided
when the trunks terminate in the End Office (as opposed to an access
tandem).

FG-D - Feature Group D. Trunk Side termination. Provides 10xxx
dialing, 1+ pre-subscription dialing, and Equal Access 800/900
service. Only available in electronic offices and some 5XB offices
(through a beastie called an Adjunct Frame.)

GAB - Group Audio Bridging. Where several people call the same
number, to talk to other people calling the same number. "Party" or
"Chat" lines.

IEC - Inter-Exchange Carrier. Someone who actually carries calls from
place to place. AT&T, Sprint, MCI are all IECs.

IP - Information Provider. Someone who sells a value-added service
over the telephone. Where you pay for the INFORMATION you're
receiving, as well as the cost of TRANSPORT of the call.

NXX - Notation convention for what used to be called a "prefix". N
represents the digits 2 through 9, and X represents the digits 0
through 9. There are 800 valid NXX combinations, but some are
reserved for local use. (411 for Directory, 611 for Repair Bureau,
911 for emergency, etc.)

ONI - Operator Number Identification. In areas with some styles of
party-line service, the CO cannot tell who you are, and the operator
will come on and say, "What number are you calling from?". You can
lie, they have to trust you. They MAY know which PREFIX you're coming
from, though.

PTN - Plant Test Number. A regular 10 digit number assigned with your
inward WATS line. This may NOT be a 'dialable' number from the local
CO. (A friend has a WATS line in Amherst, MA [413-549, #5 ESS] and
you cannot dial the PTN locally, but you can if you come in on a toll
trunk.)

SAC - Special Area Code. Bellcore speak for area codes that aren't
really places, but classes of service.

============================================================================

Closing note: The information in this [Guide to North American Area Codes]
first appeared in various parts in TELECOM Digest Volume 9, issues 2 and 15;
January 3 and January 15, 1989.

[Note: Various updates made throughout 1992 and 1993 by Carl Moore, others.]

TELECOM Digest is published once or twice daily; is distributed to a
list of telecom enthusiasts and industry employees. It is distributed
to Usenet via the comp.dcom.telecom news.group.

Patrick Townson
Telecom Digest Moderator
0

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