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AT&T TARIFF IURC NO. 20 Company, Inc. Part 1 Section 1

PART 1 - Preface 8th Revised Sheet 1 SECTION 1 - Title Sheet and Symbols

TARIFF OF INDIANA BELL , INCORPORATED

The Indiana offers services under this Tariff. AT&T Indiana is a registered (C) trade name of Indiana Bell Telephone Company, Inc. Services offered pursuant to this Tariff may be offered under those registered trade names or under the brand name AT&T. All regulated and tariffed services offered by Indiana Bell Telephone Company, Inc., whether under that name, the trade name AT&T Indiana or under the brand name AT&T, are subject to the terms and conditions of this Tariff. (Indiana Bell Telephone Company, Inc. is also referred to herein as “The Company” or “Company”).

This Tariff is issued pursuant to order in Cause No. 39705 issued June 30, 1994. Any cost data submitted under the provisions of that Order and this Tariff are to be treated as confidential, proprietary and a trade secret and exempt from public disclosure on a preliminary basis pursuant to exceptions to Indiana Code 8-1-2-29.

Explanation of Symbols

(C) - Signifies changed regulation (D) - Signifies discontinued rate, treatment or regulation ( I ) - Signifies increased rate or new treatment resulting in an increased rate (N) - Signifies new rate, treatment or regulation (R) - Signifies a reduced rate or new treatment resulting in a reduced rate (T ) - Signifies a change in text but no change in rate, treatment or regulation

Trademarks and Service Marks

Telcordia® and Common Language® are registered trademarks and iconectiv, CLCI, CLEI, CLFI, CLLI, USOC, FID, NC, NCI and NC/NCI, are trademarks of Telcordia Technologies, Inc. The Common Language codes identified herein are the proprietary information of Telcordia Technologies, Inc. d/b/a iconectiv ("iconectiv") and are licensed to AT&T Services, Inc. The Common Language codes provided herein, if applicable, are solely for the purpose of this Tariff and may not be reproduced, stored or used for any other purpose without the express, written consent of iconectiv.

ATT TN IT-21-0001 Effective: March 2, 2021 William Soards, President - Indiana