Western Cable Show - Clarent Demos LOCAL ACCESS And�SOFTSWITCH Te Chnology Submitted By: Eclat Marketing Friday, 1 December 2000

Western Cable show - Clarent demos LOCAL ACCESS andSOFTSWITCH te chnology Submitted by: eclat Marketing Friday, 1 December 2000

Contacts: Kathleen Noonan, Clarent Corporation, +1 650-481-2511, [email protected] Melissa Urry, éclat MARKETING, +44 1628 400900, [email protected] Clarent to Demonstrate Voice over IP Communications Services Via Cable Networks At Western Cable Show Demonstration to Include Preview of Clarent Local Access Products and Softswitch Technology LOS ANGELES, Calif., November 31, 2000 * Clarent® Corporation (Nasdaq: CLRN) (Booth No. 4134), a leading provider of Internet Protocol (IP) communications solutions, today announced it is demonstrating the delivery of packetized voice services based upon the CableLabs' PacketCable* set of specifications at this week's Western Cable Show. PacketCable is a CableLabs-led initiative aimed at developing interoperable interface specifications for delivering advanced, real-time multimedia services over two-way cable plant. The demonstration also will include a preview of Clarent's local access products and softswitch technology, enabling both on-net and off-net Voice over IP (VoIP) telecommunications services. This presentation is part of the exclusive CableNET* exhibit, which is co-sponsored by CableLabs and the California Cable Television Association, and which showcases numerous innovative applications being developed for broadband. Clarent's presence at the show* coupled with the demonstration of its local access products* underscore the company's momentum toward delivering a complete suite of market-ready local access products planned for the first half of 2001. "Most VoIP vendors are significantly behind in bringing a truly deployable distributed softswitch technology to market, and this demonstration of Clarent's PacketCable-based solutions reinforces our lead in the race to bringing a feature-rich product suite to market," said Peter Bohacek, senior vice president, product marketing for Clarent Corporation. "The forthcoming delivery of our local access solutions are part of the company's overall goal to redefine the way people communicate and conduct business by driving unified convergence both over cable and telecom networks."

Page 1 For the demonstration, phones will be connected to multimedia terminal adapters (MTAs) * the equipment connecting cable networks with voice and data networks * from Clarent, in addition to other equipment vendors. Clarent products used in the demonstration include the Clarent Command Center, Clarent Call Manager, Clarent Application Server, Clarent Gateway, and Clarent MTA. The 33rd annual Western Show will be held at the Los Angeles Convention Center from November 28 through December 1. About Clarent Corporation Clarent Corporation (Nasdaq: CLRN) is a global market leader in providing intelligent, software-driven products throughout IP-centric communications networks, serving more than 300 telecom service providers worldwide such as AT&T, NTT and China Telecom. Clarent solutions enable interconnection between communications service providers' networks and foster the creation of global footprints. In addition, Clarent's software platform allows 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 PacketCable PacketCable is a CableLabs-led initiative aimed at developing interoperable interface specifications for delivering advanced, real-time multimedia services over two-way cable plant. Built on top of the industry's highly successful cable modem infrastructure, PacketCable networks will use Internet protocol (IP) technology to enable a wide range of multimedia services, such as IP telephony, multimedia conferencing, telecommuter services, and other integrated multimedia applications. # # # Forward Looking Statements: This release contains forward-looking statements, including statements about the demonstration of, future development of and market availability of Clarent's local access products. These statements involve risks and uncertainties, including risks associated with the successful development, testing, and market introduction of Clarent's local access products, in addition to potential issues relating to interoperability, changes in market conditions, 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

Page 2 in Clarent's periodic filings with the SEC. Clarent, the Clarent logo, NetPerformer, DynaStar, Clarent Command Center, Clarent ThroughPacket, PowerCell, SkyPerformer, ACTview and ServiceXchange 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.

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