Clarent Enters IP Telephony Market in Greece; Two Telcos Adopt Clarent IP Telephony Technology for Their Networks

Business Wire, August 31, 1999

ST. ALBANS, England--(BUSINESS WIRE)--Aug. 31, 1999--

Clarent(R) Corporation (Nasdaq:CLRN), a worldwide leader in carrier-grade, phone-to-phone IP telephony solutions, today announced the deployment of Clarent technology in the networks of two carriers in Greece: TelePassport Hellas S.A. and Cosmoline S.A.

This announcement follows the establishment of a Clarent office in Greece in March 1999 and positions Clarent as a leading provider of IP telephony services in the Greek market.

TelePassport AG , a pan-European telecommunications provider based in Germany, was established in 1993 to service business customers in every major German city, as well as in neighbouring European countries. The company's extensive experience in offering low cost, high quality telecoms services dates back to long before the telecommunications market first began to open up, when it was already offering low cost call routing via overseas and other European nodes. TelePassport Hellas S..A. is the Greek member of the TelePassport AG Group and was recently established to provide a range of voice and fax over IP services to Closed User Groups and Corporate Networks throughout the Greek region and the Wider Balkan and Middle East Area.

As a newcomer to the Greek marketplace, TelePassport Hellas S.A's strategy is to implement the most modern and technologically advanced equipment available in order to exploit the latest advances in telecommunications and pass the benefits onto its customer base. This includes the implementation of Clarent's IP telephony call routing, management and billing technology. TelePassport Hellas S.A.'s stated intention is to greatly expand its IP services in preparation for the deregulation of the Greek telecom market after December 31st 2000, at which time it plans to focus on providing telecommunications services at far more competitive prices than those currently offered by incumbent carriers.

Cosmoline operates a fully managed, backbone network in Greece, consisting of 37 nodes, in 22 cities within the country. Cosmoline is in the process of enhancing its network by offering value-added services to its customers, one of which is Voice over IP. Cosmoline is currently offering Clarent-based VoIP services to over 90 closed user groups. During the next year it intends to grow its IP telephony services customer base in the Greek marketplace, and in the greater Balkan and Black Sea regions.

Lorenzo Stella, area vice president of Clarent for the Southern Mediterranean Region, expressed; "We are extremely excited about the development of IP telephony services within the Greek marketplace. These latest partnerships with two of the most respected emerging telecommunications companies in the country, along with our recent alliance with Greek distributor Pouliadis Associates Corp., really puts Clarent in a strong position here." -0-

Cosmoline S.A.
John Caradimas
Business Development
Tel.  30 1 9480 410
Fax.  30 1 9480 470
Email. svlcec@hol.gr

TelePassport Hellas S.A.
Kyriakos Ikonomidis
Internet Business Director
Tel.  30 1 825 7480
Fax.  30 1 825 7509
Email. Kikonomidis@telepassport.gr

Pouliadis Associates Corp.
Vasia Stasinopoulo
Public Relations
Tel.  30 1 9242 072
Fax.  30 1 9241 066
Email. gkarant@pouliadis.gr

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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 interoperability, inability to introduce new products, ability to retain key customers 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 section of the prospectus filed with the Securities and Exchange Agreement and effective June 30, 1999.

About Clarent

Clarent Corporation is a premier provider of scaleable, IP telephony products to carriers and Internet service providers around the world. Clarent's intelligent architecture and the Clarent Command Center enable Clarent products to route, manage, inter-connect and terminate high volumes calls for service provider customers including the world's largest long distance telecommunication companies. According to a Cape Saffron report published in 1999, more minutes travel across Clarent-enabled networks worldwide than those of any other equipment supplier.(1)

Founded in July 1996, Clarent is headquartered in Redwood City, California 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. -0-

(1)  Cape Saffron "Global IP Voice/ Fax Market 1999". Cape Saffron is
     an UK-based research group focused on the international voice
     market. http://www.capesaffron.com

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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.