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Area Codes 312 & 872
Telephone Central Office Building Pictures

The following are respresntative examples of telephone central office buildings in Area Code 312 and 872 (Inner City Chicago, Illinois).

Click on the pictures below for a larger version.


Chicago Zone 01

"Calumet"
 

Listing Updated:
November 2011

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILCADS0
CHCGILCADS1

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

Prefixes Served:
DS0: (312) 326, 328, 528, 567, 570, 674, 791, 808, 945

DS1: (312) 225, 842, 949

Notes:
Source: TCO

 

Chicago Zone 01

"Monroe"
 

Listing Updated:
November 2011

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILMODS0
CHCGILMODS1

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

Prefixes Served:
DS0: (312) 421, 433, 491, 572, 633, 710, 738, 829, 850

DS1: (312) 226, 243, 355, 361, 413, 432, 455, 492, 563, 569, 666, 733, 743, 746, 864, 942, 996-7

Notes:
Source: TCO

 

 


Copyright 2011 Central Office Building Pictures
Page last modified November 8, 2011
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