AT&T Ensures Network Uptime for Internet Security Systems

Upgraded AT&T Network Enables Enterprise Security Firm to Thwart Network Disruptions

Atlanta, Georgia, July 17, 2006

AT&T Inc. (NYSE: T) today announced a three-year contract with Internet Security Systems, Inc. (ISS) to upgrade its network infrastructure.

ISS, a pre-emptive enterprise security firm, was an early adopter of AT&T's Multiprotocol Label Switching (MPLS) technology in 2004. The new contract will extend AT&T MPLS services to ISS locations throughout the U.S., Europe and the Asia Pacific region. ISS will further leverage the network upgrade to add more company locations in the coming years.

AT&T's network upgrades provide ISS with disaster recovery services using the fastest and most advanced level of any-to-any mesh connectivity, ensuring that networks are not disrupted because of outages at centralized hubs.

"Internet Security Systems is in the business of protecting companies from any potential threat to their online operations," said Helen Berg, chief information officer of Internet Security Systems. "In order to provide ISS customers with the pre-emptive security they expect, ISS' business relies on the continuous network availability that AT&T network services provide. The combination of pre-emptive protection and unfaltering connectivity ensures that ISS can respond to any disruption — be it natural disasters, viruses or criminal hackers."

By leveraging its upgraded AT&T MPLS network, ISS will also roll out Voice over IP (VoIP) capabilities across its global enterprise. As a result, ISS will be able to streamline internal voice communications and achieve maximum cost-efficiencies.

In addition, the renewed contract includes dedicated Internet, long distance and AT&T ultravailable local access services.

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About Internet Security Systems
Internet Security Systems, Inc. (ISS) is the trusted security advisor to thousands of the world's leading businesses and governments, providing preemptive protection for networks, desktops and servers. An established leader in security since 1994, ISS' integrated security platform automatically protects against both known and unknown threats, keeping networks up and running and shielding customers from online attacks before they impact business assets. ISS products and services are based on the proactive security intelligence of its X-Force® research and development team — the unequivocal world authority in vulnerability and threat research. ISS' product line is also complemented by comprehensive Managed Security Services and Professional Security Services. For more information, visit the Internet Security Systems Web site at www.iss.net or call 800-776-2362.

About AT&T
AT&T Inc. is one of the world's largest telecommunications holding companies and is the largest in the United States. Operating globally under the AT&T brand, AT&T companies are recognized as the leading worldwide providers of IP-based communications services to business and as leading U.S. providers of high speed DSL Internet, local and long distance voice, and directory publishing and advertising services. AT&T Inc. holds a 60 percent ownership interest in Cingular Wireless, which is the No. 1 U.S. wireless services provider with 55.8 million wireless customers. Additional information about AT&T Inc. and AT&T products and services is available at www.att.com.

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