AT&T Inc. Announces Three-Year Contract with California Advanced Imaging Medical Associates (CAIMA)

Radiology Practice Increases Bandwidth for Increased Data Transfer

San Francisco, California, December 12, 2006

AT&T Inc. (NYSE: T) today announced an optical and data services contract with California Advanced Imaging Medical Associates (CAIMA), a radiology practice serving the leading hospitals in the western San Francisco Bay Area and throughout the United States. Under the terms of the three-year contract, AT&T will serve as the primary provider of data and networking services, delivering AT&T OPT-E-MAN® service, AT&T Managed Internet Service (MIS) and Asynchronous Transfer Mode (ATM) services.

With a combination of AT&T ATM and AT&T OPT-E-MAN service, a fully managed switched Ethernet service, CAIMA will be able to easily send and receive medical images among its 92 locations throughout the United States, including Alaska and Singapore. The WAN will sustain CAIMA's high-volume data traffic via the converged network infrastructure, which also aligns with AT&T's convergence strategy. The solution will also deliver increased bandwidth to support CAIMA's international teleradiology network, enabling CAIMA's radiologists to deliver enhanced service to their patients for improved patient care. The service will facilitate communications across the WAN by using a smart mix of Ethernet with more traditional transport solutions, supporting many business applications, including the wide range of diagnostic imaging and therapeutic services offered by CAIMA.

Additionally, AT&T MIS, a dedicated Internet connection, will support secure real-time access to the Internet across the network, 24 hours a day. MIS incorporates convenience, resources and flexibility in a completely vendor-provided Internet solution, allowing CAIMA radiologists to focus solely on patient care, leaving the management of the service to AT&T. And with ATM service, CAIMA will be able to consolidate MRI, CT and other patient scans on a high speed network for remote viewing, improving the response time from the radiologists and increasing efficiency throughout the organization.

"Speed and accuracy are imperative to providing superior patient care in the medical field, so we needed a solution capable of supporting fast and reliable data transfer," said Peter Osuna, director of IT, California Advanced Imaging Medical Associates. "The solution delivered by AT&T will support increased bandwidth, which is required for the quick transfer of MRI, CT and other patient scans, and guaranteed data arrival over the secure network, which enables our radiologists to offer enhanced patient care."

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About California Advanced Imaging Medical Associates
California Advanced Imaging Medical Associates (CAIMA) is a radiology practice serving the leading hospitals in the western San Francisco Bay Area and imaging centers across the country through teleradiology services. CAIMA has fellowship-trained radiologists in all radiology subspecialties, and many are recognized leaders in their field. Using state-of-the-art technologies, CAIMA's radiologists provide a wide range of diagnostic imaging services including neurologic imaging, orthopedic imaging, three-dimensional computed tomography (CT), ultrafast magnetic resonance imaging (MRI), and interventional and routine radiology services. CAIMA utilizes the latest, start-of-the-art technology, and has a sophisticated teleradiology network to enhance it's services. For more information about California Advanced Imaging Medical Associates, visit www.cairad.com.

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 58.7 million wireless customers. Additional information about AT&T Inc. and AT&T products and services is available at http://www.att.com.

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