Abt Associates Extends Voice Contract with AT&T, Awards Another for Network Solutions

Cambridge, Massachusetts, West Palm Beach, Florida, May 8, 2007

AT&T Inc. (NYSE: T) today announced the growth of its relationship with Abt Associates, a global government and business research and consulting firm. The expansion is highlighted by Abt Associates' decision to migrate from its current service provider to AT&T's Private Network Transport (PNT) service.

Abt Associates signed a winback agreement with AT&T to install its PNT service, which uses AT&T's Multiprotocol Label Switching (MPLS)-enabled network and provides robust scalability. The contract also includes the implementation of a wide area network (WAN)-based Voice over Internet Protocol (VoIP) offering across a seven-site U.S. network.

In addition, the PNT network provides Abt Associates with ample bandwidth to handle various disaster-recovery initiatives. Abt has two application hubs on its network — in Cambridge, Mass., and Bethesda, Md. — for added support.

The company also renewed an existing AT&T Business Network (ABN) agreement, which includes long distance voice and audioconferencing services. The extended contract makes AT&T the sole provider of all voice services to Abt Associates.

"We are pleased to expand our relationship with AT&T," said David Kiklis, director of IT for Abt Associates. "The enhanced network environment, courtesy of the PNT service, allows us to develop our own solutions for disaster recovery and data security while addressing several regulatory and audit requirements in an efficient manner."

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About Abt Associates
Abt Associates, a private, employee-owned company, applies scientific research and technical assistance expertise to a wide range of social, economic and technological policy issues; international development; clinical trials and registries; and complex business problems. Founded in 1965, Abt Associates provides services to U.S. federal, state and local governments; foreign governments; international organizations; foundations; and business and industry. Its staff of over 1,000 is located in Cambridge, Massachusetts; Bethesda, Maryland; Durham, North Carolina, Chicago, Illinois; and in Africa, Asia, Central Asia, Europe, Latin America, and the Middle East.

About AT&T
AT&T Inc. is a premier communications holding company. Its subsidiaries and affiliates, AT&T operating companies, are the providers of AT&T services in the United States and around the world. Among their offerings are the world's most advanced IP-based business communications services and the nation's leading wireless, high speed Internet access and voice services. In domestic markets, AT&T is known for the directory publishing and advertising sales leadership of its Yellow Pages and YELLOWPAGES.COM organizations, and the AT&T brand is licensed to innovators in such fields as communications equipment. As part of its three-screen integration strategy, AT&T is expanding its TV entertainment offerings. Additional information about AT&T Inc. and the products and services provided by AT&T subsidiaries and affiliates is available at www.att.com.

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