ADC and Sonus Networks Announce Global Services Alliance; ADC Providing Professional Services for Sonus VoIP Deployments.

CHELMSFORD, Mass. & MINNEAPOLIS -- Sonus Networks (Nasdaq: SONS) and ADC (Nasdaq: ADCT) announced today a global services alliance to support Sonus voice over IP (VoIP) solutions. As part of the relationship, ADC supplies a broad range of services to Sonus customers worldwide. For several Sonus VoIP deployments, ADC has effectively provided engineering, furnishing and installation (EF&I) services, rack-and-stack services, commissioning, integration, and installation-related materials.

ADC provides a broad range of services to help operators increase the capacity of their networks, more effectively manage their assets and maximize their network infrastructure. ADC has experience in delivering installation services to customers in many market areas, including wireless service providers, multiple system/cable operators, local exchange carriers, interexchange/global carriers, alternative carriers, and original equipment manufacturers.

"Sonus is dedicated to offering the best possible VoIP solutions to service providers, and our choice of product and professional service partners is extremely important in terms of the overall quality of an integrated solution," said Steve Edwards, chief marketing officer and general manager, EMEA, Sonus Networks. "We've worked with ADC on a number of customer deployments, and we know the high quality of their professional services. We're pleased to announce our relationship with ADC and to recommend ADC services to our customers."

"We've seen increased interest in VoIP solutions among our carrier customers, and Sonus has a well-earned reputation as a leader in the VoIP market," said Barbara Majerus, vice president of service management for ADC's Professional Services Business Unit. "VoIP has the potential to significantly impact the way that voice services are delivered, and we see support of VoIP deployments as strategic to our professional services business. Sonus is an important partner in the VoIP arena and we look forward to working closely together in the future."

About ADC

ADC provides the connections for wireline, wireless, cable, and enterprise networks around the world. ADC's innovative network infrastructure equipment and professional services enable high-speed Internet, data, video, and voice services to residential, business and mobile subscribers. ADC (NASDAQ: ADCT) has sales into more than 150 countries. Learn more about ADC at www.adc.com.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice over IP (VoIP) infrastructure solutions for wireline and wireless service providers. With its Open Services Architecture(TM) (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking and tandem switching, residential and business access, network border switching and enhanced services. Sonus' voice infrastructure solutions, including media gateways, softswitches and network management systems, are deployed in service provider networks worldwide. Sonus, founded in 1997, is headquartered in Chelmsford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

This release may contain forward-looking statements regarding future events that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. Readers are referred to the "Risk Factors" section of Sonus' Annual Report on Form 10-K/A dated July 28, 2004 and filed with the SEC, and the "Cautionary Statements" section of Sonus' Quarterly Report on Form 10-Q, dated November 9, 2004 and filed with the SEC, which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements. In addition, any forward-looking statements represent Sonus' views only as of today and should not be relied upon as representing Sonus' views as of any subsequent date. While Sonus may elect to update forward-looking statements at some point, Sonus specifically disclaims any obligation to do so.

Sonus is a registered trademark of Sonus Networks. Open Services Architecture, GSX9000, Insignus and Sonus Insight are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.