DALLAS--(BUSINESS WIRE)--AT&T will webcast a keynote address by Randall Stephenson, chairman and chief executive officer, AT&T Inc., at the 43rd Annual J.P. Morgan Global Technology, Media and Telecom Conference in Boston on Monday, May 18 at 8 a.m. ET. The webcast will be available live and for replay at AT&T Investor Relations. AT&T products and services are provided or offered by subsidiaries and affiliates of AT&T Inc. under the AT&T brand and not by AT&T Inc. Ab