Samsung to Resell and Support Sonus' Industry-leading VoIP Infrastructure Solutions to Wireless Service Providers Globally

SEOUL, Korea and CHELMSFORD, Mass., January 11, 2005 Samsung Electronics Company, Ltd., a global leader in telecommunication, semiconductor, digital media and digital convergence technologies, and Sonus Networks (Nasdaq: SONS), a leading provider of voice over IP (VoIP) infrastructure solutions, today announced a partnership that will facilitate the transformation of the world's wireless networks to VoIP. The companies have entered into a non-exclusive global reseller agreement through which Samsung will sell and support Sonus VoIP solutions to mobile operators around the world.

This partnership combines the strength of Sonus' industry leading VoIP technology, including the GSX9000TM Open Services Switch, and Samsung's expertise and technology in mobile networking to deliver a best-of-breed solution that enables a full range of wireless applications and services. This relationship further expands Sonus' reach into the global wireless market and enhances Samsung's VoIP strategy including providing a migration path to an all-IP wireless network.

"As wireless operators continue to experience growth in both subscribers and data traffic, they are accelerating their migration to next-generation wireless voice networks," said Hassan Ahmed, chairman and CEO, Sonus Networks. "Our partnership with Samsung leverages Sonus' proven VoIP technology to deliver a next-generation wireless solution that enables integrated multi-media services in addition to realizing reductions in operating costs."

"To meet various requirements of service operators in the rapidly growing VoIP market, Samsung realized the importance of establishing a partnership with industry pioneers like Sonus Networks. And Samsung will extend our business capabilities in Telecommunication System market continuously through these kinds of partnership," said Seyoung Oh, vice president of planning team, Telecommunication System Division, Samsung Electronics.

"Service providers are looking to develop new and innovative services to increase their revenues. It is critical for operators to migrate to an IP-based network so that they can combine voice and content to create these sticky applications," said Philip Marshall, director at the Yankee Group. "This demand has fuelled the market for mobile VoIP equipment to grow significantly with service providers worldwide looking to implement solutions, whether it is for converged offerings or for efficient next generation services. Partnerships such as the one between Sonus and Samsung demonstrate a commitment in offering an end to end solution to facilitate integration issues and expedite deployments."

Sonus has established itself as a market leader of VoIP infrastructure solutions with deployments in service provider networks worldwide. In Q3 2004, Sonus' leadership position was reaffirmed by leading market research firms who named it the market share leader in several segments of the carrier VoIP equipment market in market share reports for the quarter. Earlier this month, Sonus announced that in December 2004 alone, service providers globally reported that they are now carrying an estimated 10 billion minutes of customer traffic per month on their Sonus-based VoIP networks. The worldwide traffic milestone represented a significant increase from the estimated 6 billion minutes per month in December 2003.

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 ArchitectureTM  (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 and Insignus are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.

About Samsung Electronics

Samsung Electronics Co. Ltd. is a global leader in telecommunication, semiconductor, digital media and digital convergence technologies with 2003 parent company sales of US$36.4 billion and net income of US$5.0 billion. Employing approximately 88,000 people in 89 offices in 46 countries, the company consists of six main business units: Corporate Technology Operations, Telecommunication Network Business, Digital Appliance Business, Digital Media Business, LCD Business, and Semiconductor Business. Recognized as one of the fastest growing global brands, Samsung Electronics is the world's largest producer of color monitors, color TVs, memory chips, and TFT-LCDs. For more information, please visit http://www.samsung.com.