Clarent Teams Up With Digital China to Distribute Clarent's VoIP Local Access Solutions.

Business Editors/High-Tech Writers

REDWOOD CITY, Calif.--(BUSINESS WIRE)--April 12, 2001

Clarent(R) Corp. (Nasdaq:CLRN), a leading provider of Internet Protocol (IP) communications solutions, today announced a Local Access distribution partnership with Digital China Technology Company Limited, Clarent's wholesale distributor in mainland China. The agreement will enable Digital China to promote and sell Clarent's new OpenAccess(TM) solution through its extensive channel network across the country. This agreement is part of Clarent's global strategy to build a channel network for its Clarent OpenAccess solution, which was launched globally in late March.

Clarent OpenAccess is a software-driven VoIP solution that enables service providers -- including both traditional telecommunications carriers and alternative service providers such as CLECs, cable operators, ASPs and others -- to offer traditional and advanced telecommunications services over the "last mile" of any communications network, independent of the network type.

"With Digital China's extensive sales channel networks throughout the mainland, we are able to speed up the delivery of our OpenAccess solution to the local market," said Matthew Chiang, president, Asia Pacific, Clarent Corp. "We look forward to co-operating with Digital China to enable local service providers and enterprises reap the benefits of this solution."

Lin Yang, vice president of Digital China, added: "We are pleased to partner with Clarent, a leading provider of IP communications solutions. Clarent has become the first IP communications vendor in China to receive the Chinese government's rigorous Network Access License of Telecommunication Equipment (NALTE) certification. We believe that the partnership puts us in a win-win situation."

The Clarent OpenAccess solution enables service providers to integrate and manage voice and data transmission over a single network, providing new potential sources of revenue while reducing capital investments, deployment time and operating and service costs. For those service providers who have already deployed VoIP solutions in the long distance portion of their networks, Clarent OpenAccess provides a natural extension of their services directly to end users.

Clarent has enjoyed success in the Chinese telecommunications market, working with three of the six telecommunications service providers including China Mobile, China Telecom and Jitong Communications.

About Clarent

Clarent Corp. (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 and has offices in Asia, Europe, Latin America and North America. To learn more about Clarent, visit its Web site at www.clarent.com.

Forward Looking Statements

This release contains forward-looking statements, including statements about the expected development of market demand for Clarent's OpenAccess solutions in China, the speed with which Clarent and Digital China will be able to deliver product to meet demand, and the expected benefits of the OpenAccess solution for service providers. These statements involve risks and uncertainties, including risks and uncertainties associated with the future demand for and adoption of IP communications in China, as well as potential issues relating to the functional and technical performance of Clarent's OpenAccess solution, changes in government regulations and the international communications industry, technological changes and other factors which could cause actual results to vary materially from those expressed in or indicated by the forward-looking statements. These risks and uncertainties are described further in the risk factors discussed in Clarent's periodic filings with the SEC.

Trademarks

Clarent, the Clarent logo, Clarent OpenAccess, NetPerformer, DynaStar, Clarent Command Center, Clarent ThroughPacket, Clarent CPG, Clarent OpenAccess, PowerCell, SkyPerformer, ACTview and ServiceXchange are trademarks or registered trademarks, and "The Clearer. The Better" is a service mark of Clarent Corp. in the United States and other jurisdictions. All other trademarks, registered trademarks and service marks are the property of their respective owners.