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Area Code 423
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Code 423 (southeastern Tennessee).

Click on the pictures below for a larger version.


Athens

Photo 2

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
ATHNTNMADS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(423) 507, 649, 744-6

Notes:
Photo 2 source: Larry P. (August 2015). Current photo source: GSV
 

Benton

Photo 2

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
BNTNTNMTRS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(423) 338
(706) 328

Notes:
Also serves Tennga, GA.
Photo 2 source: Larry P. (September 2016). Current photo source: GSV
 

Blountville

Photo 2

Listing Updated:
September 2012

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
BUVLTNXARS0

Switch Type:
Ribbon/Genband/Nortel RSC

Prefixes Served:
(423) 279, 323, 325, 354, 917

Notes:
Photo 2 source: Craig L. (September 2012). Current photo source: GSV
 

Bulls Gap

Photo 2

Listing Updated:
September 2012

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
BLGPTNMARS0

Switch Type:
Nokia/Siemens EWSD RSU

Prefixes Served:
(423) 235, 601

Notes:
Photo 2 source: Larry P. (September 2012). Current photo source: GSV

 

Charleston

Photo 2

Listing Updated:
August 2015

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTNTNMTRS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(423) 336, 780

Notes:
Source: Larry P.
 

Chattanooga

"Brainerd"

Photo 2 | Photo 3

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTGTNBRDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 296, 485, 490, 499, 510, 553, 846, 855, 892-4, 899, 954

(706) 891

Notes: Photo 2 is from July 2008. Photo 3 is from March 2006 (when this was a BellSouth office.)

 

Chattanooga

"Dodds"

Photo 2

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTGTNDTDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(423) 493, 495, 622, 624, 629, 697-8

Notes:
Photo 2 from March 2006. Current photo source: GSV. CO building is behind a fence behind a business.

 

Chattanooga

"Harrison"

Photo 2

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTGTNHTDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 326, 344

Notes:
Photo 2 from March 2006. Current photo source: GSV.

 

Chattanooga (Hixson)

"Middle Valley"

Photo 2 | Photo 3

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTGTNMVDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 842-3, 847

Notes:
Photos 2 and 3 from March 2006. Current photo source: GSV.

 

Chattanooga

"Ninth Street"

Photo 2 | Photo 3 | Photo 4
Photo 5 | Photo 6 | Photo 7

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTGTNNSDS0
CHTGTNNSDS1

Switch Type:
DS0: Ribbon/Genband/Nortel DMS-100
DS1: Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
DS0: (423) 634
DS1: (423) (423) 209, 265-7, 321, 386, 425, 642, 668, 751-2, 755-7, 763, 778, 785
(706) 630

Notes:
MLK Blvd. was originally Ninth Street, hence the name of the central office. Photo 2 from July 2008. Photos 5-7 are from the original photo set in March 2006 when this was still a BellSouth office. Current photo source: GSV

 

Chattanooga

"Red Bank"

Photo 2 | Photo 3
Photo 4 | Photo 5

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTGTNRBDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 870, 874-7

Notes:
Photos 2-5 from March 2006. Current photo source: GSV

Chattanooga

"Saint Elmo"

Photo 2

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTGTNSEDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 821, 822, 825
(706) 820

Notes:
Photo 2 from March 2006. Current photo source: GSV

 

Chattanooga

"Signal Mountain"

Photo 2

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CHTGTNSMRS0 (Telcordia)
CHTGTNSMRS5 (NANPA)

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(423) 517, 883, 886

Notes:
Photo 2 from March 2006. Current photo source: GSV.


 

Church Hill

Photo 2

 

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
CHHLTNXARS0

Switch Type:
Ribbon/Genband/Nortel RSC

Prefixes Served:
(423) 256, 357

Notes:
Photo 2 from Larry P. (June 2014). Current photo source: GSV


 

Cleveland

Photo 2 | Photo 3

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
CLEVTNMADS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 339, 472-3, 476, 478-9, 559, 614, 728, 961

Notes:
Also serves the Georgetown ratecenter. Photo 2-3 source: Larry P. (August 2015). Current photo source: GSV
 

Elizabethton

Photo 2

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
ELTNTNXADS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(423) 542-3, 547

Notes:
Photo 2 source: Larry P. (July 2015). Current photo source: GSV


 

Englewood

Listing Updated:
September 2016

Operatng Company:
TDS Telecom/Tellico Telephone

CLLI:
ENWDTNXADS1

Switch Type:
Digital Switch (unknown type)

Prefixes Served:
(423) 885, 887

Notes:
Source: Larry P.
 

Etowah

Listing Updated:
September 2016

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
ETWHTNMTRS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(423) 263

Notes:
Source: Larry P.
 

Greeneville

Photo 2 | Photo 3

 

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
GRVLTNXADS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 359, 636, 638-9, 783, 787, 798

Notes:
Photo 2 source: Larry P. (July 2014). Current photo source: GSV


 

Hampton

 

Listing Updated:
July 2015

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
HMPNTNXARS0

Switch Type:
Ribbon/Genband/Nortel RSC

Prefixes Served:
(423) 725, 896

Notes:
Source: Larry P.


 

 

Johnson City

"Main"

 

Listing Updated:
January 2013

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
(was JHCYTNXADS0)

Switch Type:
(was Ribbon/Genband/Nortel DMS-100)

Prefixes Served:
None

Notes:
This CO is no longer in use and the prefixes served out of it are now served out of Johnson City "North" (see below). Source: Jason B.


 

Johnson City

"North"

Photo 2

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
JHCYTNXCPS0

Switch Type:
Packet Switch (unknown type)

Prefixes Served:
(423) 232, 262, 282-3, 410, 431, 433-4, 439, 461, 610, 854, 915, 926, 928-9, 938, 952-3, 975, 979

Notes:
Photo 2 source:Jason B. (January 2013). Current photo source: GSV


 

Kingsport

"XA"

Photo 2 | Photo 3 Photo 4

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
KGPTTNXADS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(276) 225
(423) 224, 229-30, 245-7, 378, 390, 392, 578, 857

Notes:
Also serves Morrison City, VA. Photos 3-4 source: Larry P. (June 2014). Current photo source: GSV


 

Kingsport

"XC"

Photo 2

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
KGPTTNXCRS0

Switch Type:
Ribbon/Genband/Nortel RSC

Prefixes Served:
(423) 288, 343

Notes:
Photo 2 source: Larry P. (July 2015). Current photo source: GSV


 

La Folette

Photo 2

Listing Updated:
July 2021

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
LFLTTNMADS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 562-3, 566, 907

Notes:
Photo 2 source: Larry P. (July 2015). Current photo source: GSV


 

Limestone

Photo 2

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
LMSTTNXADS0

Switch Type:
Ribbon/Genband/Nortel DMS-10

Prefixes Served:
(423) 257

Notes:
Photo 2 source: Larry P. (June 2014). Current photo source: GSV


 

Madisonville

Listing Updated:
September 2012

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
MDVITNMTDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 420, 442

Notes:
Source: Larry P.


 

Midway (Sullivan)

Photo 2

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
MDWYTNXARS0

Switch Type:
Ribbon/Genband/Nortel RSC

Prefixes Served:
(423) 239

Notes:
Photo 2 source: Larry P. (July 2015). Current photo source: GSV


 

Morristown

Listing Updated:
June 2014

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
MRTWTNMADS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 317-8, 492, 522, 581, 585-7
(865) 993

Notes:
Also serves Bean Station. Source: Larry P.


 

Mosheim

Photo 2

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
MOSHTNXARS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(423) 422

Notes:
Photo 2 source: Larry P. (June 2014). Current photo source: GSV


 

Newport

Listing Updated:
July 2015

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
NWPTTNMTDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(423) 613, 623, 625
(865) 509

Notes:
Also serves Chestnut Hill. Source: Larry P.


 

Niota

Listing Updated:
August 2015

Operating Company:
TDS/Tellico Telephone Company

CLLI:
NIOTTNXARS0

Switch Type:
Nokia/Siemens/Stromberg Carlson DCO DCL

Prefixes Served:
(423) 568

Notes:
Source: Larry P.
 

Ooltewah

Photo 2 | Photo 3
Photo 4 | Photo 5

Listing Updated:
July 2021

Operating Company:
CenturyLink/CenturyTel/Ooltewah-Collegedale Telephone

CLLI:
OLTWTNXADS1

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(423) 238

Notes: Originally a small independent (Ooltewah-Collegedale Telephone), was bought by CenturyTel and is now CenturyLink. Photos 2-5 are from July 2008. Current photo source: GSV. Photo 2 shows customer service office on left, switch building on right. Photo 3 is close-up of customer service office, Photo 4 is close-up of switch building, and Photo 5 is an old Charge-A-Call phone for people to order service or report an outage.

 

Rogersville

Listing Updated:
September 2012

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
RRVLTNMADS0

Switch Type:
Nokia/Siemens/Stromberg Carlson DCO

Prefixes Served:
(423) 272, 921

Notes:
Source: Larry P.


 

Sullivan Gardens

Photo 2

Listing Updated:
July 2021

Operating Company:
CenturyLink/Embarq/Sprint/United Telephone

CLLI:
SLGRTNXARS0

Switch Type:
Ribbon/Genband/Nortel RLC

Prefixes Served:
(423) 349, 516

Notes:
Photo 2 source: Larry P. (July 2015). Current photo source: GSV


 

Surgoinsville

Listing Updated:
June 2014

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
SRVLTNMADS0

Switch Type:
Nokia/Siemens/Stromberg Carlson DCO Remote Network Switch

Prefixes Served:
(423) 345

Notes:
Source: Larry P.


 

Sweetwater

Listing Updated:
August 2015

Operating Company:
at&t/BellSouth/South Central Bell

CLLI:
SWTWTNMTRS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(423) 337, 351
(865) 213

Notes:
Also serves the West Sweetwater ratecenter. Source: Larry P.
 

Vonore

Listing Updated:
September 2016

Operating Company:
TDS Telecom/Tellico Telephone

CLLI:
VONRTNXADS1

Switch Type:
Digital Switch (unknown type0

Prefixes Served:
(423) 792, 884

Notes:
Source: Larry P.
 

 


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Page last modified July 4, 2021
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