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Clarent Software Allows Optus to Expand Its Global Footprint from
Australia to More Than 70 Countries Worldwide

REDWOOD CITY, Calif., January 10, 2000 * Clarent(tm) Corporation (Nasdaq:
CLRN), a leading provider of Internet Protocol (IP) communications
solutions, today announced that Australian telecommunications service
provider, Cable & Wireless Optus, has chosen Clarent communications
to power its Global VoIP (Voice over IP) Network Management Platform for
long-distance calling services.

The seamless integration of Clarent's network management software and
carrier gateways with Optus voice and data networks will help this Tier 1
Carrier expand its footprint in Australia and to more than 70 countries
served by Clarent-powered IP telephony networks. This VoIP expansion also
positions Optus to meet the increasing demands of its customers for
converged, value-added communications services.

Alan Petts, Director International of Cable & Wireless Optus said, "We
Clarent's IP telephony software and gateways for the backbone of the Optus
Global VoIP network because it enables faster interconnections without
sacrificing voice quality."

"Clarent's carrier customer base gives us access to more than 260 global
service providers that we're now able to trade minutes with. This is a
significant step forward for expanding Optus VoIP network reach to
overseas markets," said Mr Petts.

The Clarent Command Center(tm) will be used to manage and bill Optus IP
telephony traffic, as well as provision and service its customers.
VoIP Gateways, with C7 signalling capability, will be used to interoperate
with multiple and diverse PSTN switched networks. Clarent
software also will be used to maximise network bandwidth utilisation.

"With the integration of Clarent software into the Optus network platform,
our IP-based communications platform is now used by the top three
telecommunication service providers in Australasia, which transport more
than 85 percent of Australian and New Zealand voice and data traffic,"
Rich Heaps, COO, Clarent Corporation.

"In the coming years, we hope to bring Clarent IP telephony solutions into
the Australian local loop, which will allow local telcos to create
additional income streams by offering innovative communications features
their local business and consumer customers."

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
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

About Cable & Wireless Optus

Cable & Wireless Optus is Australia's leading integrated communications
company - serving around four million customers each day. The company
provides a broad range of communications services including mobile,
and long distance services, local telephony, business network services,
internet and satellite services and pay television.

Since commencing operations in 1992, Cable & Wireless Optus has invested
more than AUS $7 billion in the construction of fixed, mobile and
networks, including central business district and suburban local access
networks. These networks provide the company with an advanced technology
platform capable of delivering integrated communications, information and
entertainment services.

Cable & Wireless Optus is a member of the Cable & Wireless Group, a leader
in global communications operating in more than 70 countries around the

Forward Looking Statements: This release contains forward-looking
statements, including statements about the future use and functionality of
Clarent's products in the Optus VoIP network and the expected speed of
interconnections and voice quality provided by Clarent products. These
statements involve risks and uncertainties, including potential issues
relating to successful deployment of Clarent's products in the Optus VoIP
network as well as issues related to interoperability, technological
performance, changes in market conditions, the international
industry, 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
factors discussed in Clarent's periodic filings with the SEC.

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

This press release was distributed by ResponseSource Press Release Wire on behalf of eclat Marketing in the following categories: Consumer Technology, Personal Finance, Business & Finance, Computing & Telecoms, for more information visit