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-New SS7 redundancy software and CompactPCI hardware
platforms offer unparalleled reliability between IP gateways
and PSTN networks-

Natural MicroSystems (NMS), provider of open-standards
development tools for the telecoms industry, today announced
new high-end SS7 offerings to provide unprecedented
availability and reliability to service providers and to
enable developers to build carrier-class systems without a
single point of failure. SS7 is the leading call handling
protocol for the traditional telephone network, providing
highly reliable connections between packet-switched IP
gateways and the circuit-switched PSTN. These offerings will
bring added reliability to IP-based services which will
enable global carriers and service providers to greatly
improve quality of service and functionality.

The new solutions include release 3.0 of NMS's SS7
redundancy software, and TX Series CompactPCI and PCI
hardware platforms for exceptional reliability. Natural
MicroSystems' SS7 Redundancy solution enables developers to
build absolutely reliable carrier-class systems. In
addition, CompactPCI for SS7 will introduce a new level of
availability for service providers. CompactPCI is a robust
hardware platform offering "hot swap" capabilities which
will allow service providers to extract boards without
adversely affecting a running system.

High availability is particularly crucial to new
revenue-generating services for carriers such as messaging
applications, wireless communications and gateways for
Voice-over-IP networks. NMS's expansion of its award-winning
SS7 technologies underscores the value of its expertise in
providing carrier-grade technology for IP-centric and
traditional PSTN circuit switched telephony networks.

Chris Smith, director of wireless and IN products for
Natural MicroSystems comments, "Equipment providers look to
strategic partners to provide technology that can address
the complexities and deployment challenges of a
carrier-class environment while supporting multiple SS7
standards. With the release of our Redundant SS7 and TX
Series CompactPCI technologies, we are solidifying our
leadership position in providing enabling technology for
suppliers of carrier-grade systems."

"We've been very happy with our deployments of Natural
MicroSystems AG and TX Series SS7 technology around the
world," said Mike Vargo, senior vice president and chief
technology officer, Clarent Corporation. "The SS7
capabilities announced today will bring the added
functionality and reliability that are being requested by
global carriers offering IP telephony services today and
going forward."

About SS7

As the leading call handling protocol for the traditional
telephone network, SS7 provides the reliability and speed
required for passing all call control information in
carrier-grade systems. SS7 has continued to gain acceptance
in new areas such as Voice over IP and wireless IP (VoIP)
gateways due to the highly reliable connections it provides
between packet-switched IP gateways and the circuit-switched

About Clarent Corporation

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 of 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.*

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

About Natural MicroSystems

Natural MicroSystems (NASDAQ: NMSS), based in Framingham,
MA, provides IP-centric software development tools,
hardware, reference designs and consulting services to the
leading suppliers of communications equipment. The
network-quality products, technologies, design and
customisation resources make Natural MicroSystems the OEM
partner of choice for the rapidly growing number of
manufacturers that are building platforms to support today's
convergence applications.

By using Natural MicroSystems' products and services,
equipment providers benefit from reduced time-to-market when
delivering best-in-class high-performance IP gateways, IP
media servers, wireless/IP gateways, network-based enhanced
services and other voice/data/video solutions. This is
because Natural MicroSystems' state-of-the-art products and
technologies, including SS7 and CompactPCI, are based on
open, standards-based platforms collectively referred to as
Open TelecommunicationsTM. Founded in 1983, Natural
MicroSystems products and services are available in more
than 40 countries, and the quality processes at the company
have earned ISO 9002 certification. More information on the
company is available at:

About Natural MicroSystems SS7 Product Family

Natural MicroSystems' high-end SS7 solutions for PSTN
networks offer: · Market leading high performance at low
cost · Rapid time-to-market and ease-of integration through
CT Access, Natural MicroSystem's comprehensive, flexible OEM
software development environment · Interoperability between
product generations for maximum return on investment ·
Worldwide support through highly experienced, senior
engineers who are deployed wherever Natural MicroSystems'
customers need them

Natural MicroSystems, Open Telecommunications, NaturalFax,
CT Access, and NaturalEdge are trademarks of Natural
MicroSystems Corporation. Alliance Generation is a
registered trademark of Natural MicroSystems Corporation.
All other product or corporate references are trademarks or
registered trademarks of their respective companies.

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