AT&T Announces New Contract with John Muir Health

Walnut Creek, California, July 11, 2007

AT&T Inc. (NYSE:T) has announced a new optical networking services contract with John Muir Health. John Muir Health is a nationally recognized comprehensive health care provider with two medical centers, including a trauma center that serves Contra Costa and portions of Solano County, Calif. Under the terms of the five-year contract, AT&T will serve as the primary networking services provider, delivering AT&T OPT-E-MAN® service to connect one of John Muir's more remote locations to the main data center in Walnut Creek.

AT&T OPT-E-MAN service, a fully managed, switched Ethernet network service will provide secure and economical communications between John Muir Health's main campus and the remote facility. OPT-E-MAN service is also scalable and flexible in bandwidth from 10 Mbps to 1 Gbps, which is ideal for the ever-growing quantity of critical health care applications. Additionally, the redundant service will support doctors and health care practitioners from any location throughout the network.

By using a unified network platform, John Muir Health will be able to support multiple business applications, such as electronic medical records, as well as remote access to patient health information and medical images for radiology. The solution will provide reliable transport and enhanced security across the converged network and will enable John Muir's health care professionals to provide better patient care across the John Muir Health network of facilities.

"We have a long-standing relationship with AT&T, and when the need surfaced for a communications provider capable of deploying a state-of-the-art networking solution to connect our multiple locations, we called on AT&T," says Eric Saff, chief information officer for John Muir Health. "The optical networking solution provided by AT&T will allow us to focus our efforts on the most important aspect of our business: our patients."

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About John Muir Health
John Muir Health is a not-for-profit organization that includes John Muir Medical Center – Walnut Creek Campus, a 321-bed medical center that serves as Contra Costa County's only designated trauma center; and John Muir Medical Center – Concord Campus, a 251-bed medical center in Concord. Together, they are recognized as preeminent centers for cardiovascular care, orthopedics, neurosciences, cancer care and high-risk obstetrics and newborn care. Also parts of John Muir Health are the John Muir Behavioral Health Center, the John Muir Physician Network and outpatient centers. Visit www.johnmuirhealth.com for more details.

About AT&T
AT&T Inc. (NYSE: T) 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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