Clarent Corporation Expands Presence in Asia Pacific with Opening of Offices in Hong Kong and Singapore; Clarent Also Adds New Country Manager for Taiwan.

HONG KONG--(BUSINESS WIRE)--Dec. 7 1999--

Clarent(R) Corporation (Nasdaq:CLRN), a worldwide leader in providing carrier-grade, phone-to-phone Internet Protocol (IP), announced today the opening of two additional offices in Asia Pacific; the hiring of management teams in those new offices; and the hiring of a country manager in Taiwan.

The new country offices will be in Hong Kong and Singapore.

These new offices will expand Clarent's existing presence in the Asia Pacific region. Clarent already has offices in Taipei, Tokyo, Seoul and Beijing. Clarent's localized offices provide sales, service and regional marketing in their respective countries.

Clarent's Hong Kong office is being headed by T. K. Leung. Leung will start with Clarent on 14 December 1999. Prior to joining Clarent, Leung worked for Hongkong Telecom for 10 years, where he was Manager of International Business and Manager for International Switching Service. Before joining Hongkong Telecom, Leung was a sales engineer with Hewlett Packard. Leung received his undergraduate degree with Honors in Electrical Engineering and also received his Master of Business Administration, both from The City University of New York (CUNY).

The General Manager for Clarent Singapore is Thomas C. K. Chu. Prior to joining Clarent, Chu was Deputy Country Manager for Global One Communications in Singapore. Before Global One, Chu was Regional Sales Director with Lucent Technologies. Chu holds a Masters of Science in Electronics from the Queen's University of Belfast, Northern Ireland, U.K. He will be responsible for covering existing Asian countries for Clarent as well as for covering the new markets of India, Pakistan, Sri Lanka and Bangladesh.

Clarent has also hired a country manager for Taiwan. This new country manager is Kevin Chang, who came to Clarent from Ericsson Taiwan, where he was Senior Manager and Department Manager, Enterprise Network. Before Ericsson, Chang was a Sales Manager for Bay Networks in Taiwan, and prior to that, was Account Manager and Sales Executive for Hewlett Packard Taiwan. Chang holds a B.Sc. in Chemical Engineering from National Taiwan University and also holds an MBA from National Cheng-Chih University, Taiwan.

All three of these new country managers will report to Mahan Wu, Senior Vice President and General Manager, Clarent Asia Pacific.

Wu spoke of the new appointments: "Clarent is extremely pleased to be increasing its local presence in Hong Kong and Singapore. We are very fortunate to be bringing such experienced talent to these new offices and to our Taiwan headquarters. This increased presence and these appointments reflect Clarent's current success as well as promising growth potential for carrier and enterprise IP telephony business in each of these markets."

The addresses for the new Clarent offices in these countries are as follows:

Clarent Hong Kong Limited Room 1407, 14/F China Merchants Tower, Shun Tak Centre, 168-200 Connaught Road Central, Hong Kong Tel: [phone] Fax: [phone]

Clarent Singapore Pte. Ltd. 67B Kim Yam Road Singapore 239367 Tel: [phone] Fax: [phone]

Forward Looking Statements

This release may contain forward-looking statements regarding Clarent's products, business, customers or other factors that may affect future earnings or financial results. Such statements involve risks and uncertainties, including but not limited to potential issues relating to changes in market conditions, government regulations, the international communications industry, ability to retain key customers, 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 recent Prospectus, filed with the Securities and Exchange Commission on Nov. 23, 1999.

About Clarent Corporation

Clarent Corporation is a premier provider of scalable, IP telephony products to carriers and Internet service providers around the world. Clarent's intelligent, open architecture and the Clarent Command Center enable Clarent products to route, manage, inter-connect and terminate high volumes of calls for service provider customers including the world's largest long distance telecommunication companies. More minutes travel across Clarent-enabled IP telephony networks worldwide than those of any other equipment supplier(1).

Founded in July 1996 and publicly owned since July 1999, Clarent is headquartered in Redwood City, Calif. and has offices in major cities in Asia, Europe, Latin America and North America. Additional information about Clarent is available at http://www.clarent.com.

Note to Editors: Clarent is a registered trademark of Clarent Corporation in the United States and other jurisdictions. All other company or product names mentioned may be trademarks or registered trademarks of the respective companies with which they are associated.

(1) "IP Telephony Clearinghouses -- A New Business Model." Published November 1999 by iLocus. iLocus, a division of Cape Saffron Ltd., is a UK-based research group focused on the IP telephony industry. http://www.ilocus.com.