General Dynamics To Resell Clarent's Voice-Over-IP Solutions to Federal, State and Local Government Agencies.

Business Editors/High-Tech Writers

ANNAPOLIS JUNCTION, Md. & REDWOOD CITY, Calif.--(BUSINESS WIRE)--May 21, 2001--General Dynamics Electronic Systems, a business unit of General Dynamics (NYSE:GD), has signed an agreement with Clarent(R) Corporation (Nasdaq:CLRN) that will provide federal, state and local government agencies easier access to Clarent's line of voice-over-Internet Protocol ("VoIP") solutions for communicating voice, data and fax transmissions over intranets and the Internet.

The agreement allows General Dynamics to act as the first government-focused value-added reseller of Clarent's products and services, which currently are used by more than 300 major telecommunication carriers and service providers worldwide. Government customers now have the option of expanding and improving their telecommunications networks and services with Clarent's IP-based solutions, keeping pace with commercial trends that have seen IP-based phone-to-phone traffic grow from none in 1995 to 15.8 billion minutes in 2000 - 31 percent of which traveled over Clarent powered networks, according to a market report by iLocus.com.

Clarent's products transfer voice, data and fax using packet-switched technology that breaks information into packets, sends them, and reassembles them at the destinations. This Internet Protocol (IP) method is efficient because it takes up network space only during transmission, and allows the simultaneous transmission of voice, fax and data over the same network.

"This is an example of how General Dynamics helps government customers obtain the latest commercial technologies," said Dave Johnson, vice president of Electronic Systems' Signals Intelligence business organization, in Annapolis Junction, Md. "Not only do we build and integrate custom computer and telecommunications systems for national security customers, we also serve as a value-added broker of market-proven communications solutions such as Clarent's IP solutions."

"General Dynamics' reputation and global reach will allow federal agencies and state governments to reap the benefits and efficiencies of IP-based communications that Clarent's commercial customers are enjoying already. The relationship also opens up a key vertical market for Clarent," said Jerry Chang, Clarent Corporation's CEO.

General Dynamics Electronic Systems will offer Clarent's solutions to its current customers and the two companies will jointly present product information at leading government trade shows.

About Clarent

Clarent Corporation (Nasdaq:CLRN) is a world leader in providing intelligent, software-driven products for new generation, IP-based communications networks. Clarent solutions enable interconnection among communications service providers' disparate networks and foster the creation of global footprints for more than 300 telecom service providers worldwide, including AT&T, NTT and China Telecom. Clarent's software platform and softswitch encourage innovation by allowing carriers to develop multiple new features for consumers and enterprises. Founded in 1996, Clarent is headquartered in Redwood City, Calif. and has offices in Asia, Europe, Latin America and North America. To learn more about Clarent, visit its Web site at www.clarent.com.

About General Dynamics Electronic Systems

General Dynamics Electronic Systems, a business unit of General Dynamics, designs, builds and supports information systems and communications systems for national security customers. The company provides support for a wide range of missions, including information operations; intelligence and signals processing, exploitation and analysis; battlespace management; imagery; collaboration; and knowledge management. General Dynamics, headquartered in Falls Church, Va., employs approximately 46,000 people and anticipates 2001 sales of approximately $11.5 billion. The company has leading market positions in business aviation, information systems, shipbuilding and marine systems, and land and amphibious combat systems. More information about General Dynamics is available at http://www.generaldynamics.com

Forward Looking Statements

This release contains forward-looking statements, including statements about expected future growth of the General Dynamics Electronic Systems distribution of IP communications technology, about the expected functionality and performance of Clarent's products, and about General Dynamics Electronic Systems expected future offerings of Clarent solutions to their customers. These statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied in the forward-looking statements, including risks related to continued favorable market conditions and future demand for advanced telecommunications services in North America, Clarent's ability to develop and maintain its relationship with General Dynamics Electronics Systems, the success of General Dynamics Electronics Systems distribution of Clarent's technology as well as potential issues relating to Clarent's ability to introduce new products and ability to retain customers, changes in market conditions, changes in US and foreign government regulations and technological changes. Additional risk factors that may affect our results are detailed in Clarent's periodic filings with the SEC.

Trademarks

Note to Editors: Clarent, the Clarent logo and Clarent Command Center are trademarks or registered trademarks, and "The Clearer. The Better" is a service mark of Clarent Corporation in the United States and other jurisdictions. All other trademarks, registered trademarks and service marks are the property of their respective owners.