Local Calling Guide

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Switch: CHCGILSU

Switch (link to prefixes) Switch name Company
CHCGILSUDS0 CHICAGO SUPERIOR  9329 ILLINOIS BELL TEL CO 
CHCGILSUDS1 CHICAGO SUPERIOR   
CHCGILSUDS2 CHICAGO SUPERIOR  9329 ILLINOIS BELL TEL CO 

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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