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Release Adds MGCP, CALEA Support, Linux Support and High-Density Universal
Port Capacity; Reduces IP Bandwidth Requirements with Clarent
ThroughPacket Technology

Natural MicroSystems (NASDAQ: NMSS), the technology leader enabling a new
era of communications, today announced a new release of its
high-performance Fusion Internet Protocol (IP) telephony development
software, which adds a broad range of new features geared to fast and
cost-effective development of core network and high-capacity access
gateways. By offering these new features in its already strong,
standards-based Fusion IP telephony software, NMS delivers even greater
value to communications equipment suppliers introducing high capacity
media and access gateways.

Features introduced with Fusion 4.2 include:

· MGCP support. Support for the MGCP (Media Gateway Control Protocol)
specification allows products developed with Fusion to interoperate with
softswitches and other MGCP-compliant systems. MGCP is the protocol of
choice for softswitch vendors to communicate with one or more media
gateways in new-generation packet voice networks. By implementing MGCP as
a service within the Natural Access development environment, NMS makes it
far easier for communications equipment providers to support this
important protocol in their products.

· Clarent ThroughPacket technology. Fusion enables efficient use of IP
bandwidth through a unique, Internet Protocol multiplexing technology from
Clarent Corporation. Clarent ThroughPacket transmits voice packets using
less bandwidth and a reduced packet rate compared to standard IP/RTP
(Realtime Transport Protocol) voice transmissions.

· CALEA readiness. The ability to duplicate, redirect and fork RTP streams
allows products based on Fusion 4.2 to comply with the U.S. Communications
Assistance for Law Enforcement Act (CALEA). Enacted by Congress in 1994,
CALEA establishes a September 2001 deadline requiring that
telecommunications carriers' services and systems conform to standards
that permit law enforcement officials to conduct legally authorised
electronic surveillance. Additionally, applications can redirect media
streams to media servers for voice processing applications. RTP
redirection and forking allow easy development of enhanced services such
as calling card and call redirect or transfer applications.

· Linux support. Fusion 4.2 runs under the Linux operating system, in
addition to the Windows NT, Windows 2000 and SPARC Solaris operating
systems supported by earlier versions.

· High-capacity CG 6000C support. Fusion provides programming support for
the Convergence Generation (CG) 6000 Series packet telephony platforms and
adds support for the 224 universal port version of the CG 6000C.
Specifically developed for high-capacity gateways, the 224 port CG 6000C
can be matched with the PowerAccess HYPER T3 Network Adapter to provide a
T3 (672 ports) IP telephony subsystem with only four CompactPCI boards.
With universal port functionality, any two complex IP voice coders (such
as G.723.1 and G.729a/b, with G.711, T.38 fax and call control) can be
applied to any of the 224 CG 6000C ports on a call-by-call basis.

· Support for in-band DTMF carriage. Media gateways need to support both
in-band and out-of-band DTMF carriage. Fusion 4.2 still includes the
H.245-style out-of-band DTMF carriage support offered in previous versions
of Fusion. Fusion 4.2 introduces the newer in-band DTMF carriage technique
endorsed by the ITU-T and described in RFC 2833, including DTMF
regeneration as well as host application notification. This provides the
interoperability presently lacking in proprietary in-band DTMF carriage
techniques offered by various vendors.

· SNMP Realtime Transport MIB. Fusion 4.2 supports the Simple Network
Management Protocol (SNMP) Management Information Base for Realtime
Transport Protocol (RTP MIB) as defined by the IETF Audio/Video Transport
(AVT) Working Group RFC 2959. This allows for remote monitoring of RTP
information on a Fusion platform.

Developers can rapidly create exceptionally scalable, highly available and
cost-competitive products that are suited for service provider core
networks by combining Fusion 4.2 with other carrier-grade platforms from
NMS, including:

· CG 6000C (CompactPCI) board

· PowerAccess HYPER-T3 DS-3/STS-1 broadband access adapter

· CG 6000eC PowerBlade voice-over-IP (VoIP) subsystem

· TX3220 Signaling System 7 (SS7) products

"Fusion 4.2 highlights NMS' relentless push to infuse our next-generation
platforms with the industry's most extensive capabilities and maximum
value," said Michel Laurence, vice president and general manager of NMS'
Network Access business. "For example, we now offer communications
equipment suppliers a base for high-density gateways that scale to
thousands of ports and support the protocols needed to work with advanced
softswitch gear. Because we are continuously building more into our IP
telephony platforms, communications equipment suppliers can start out
ahead and stay ahead when they choose NMS."

The new version of Fusion will be commercially available in July 2001.
Upgrades to Fusion 4.2 from previous versions of Fusion will be available
to current NMS customers free of charge. The MCGP feature is priced

Expanded Capabilities for a Market on the Rise

Market research firm IDC predicts the worldwide carrier gateway switch
market will grow from $345 million in 2001 to $4.7 billion in 2005,
reflecting the steady adoption of new generation infrastructure for voice
traffic. Carriers are adopting high capacity media gateways, softswitches,
signaling gateways and media servers as lower cost, more scalable
replacement technology for today's switched circuit voice network.

Industry Leaders See Major Benefits in Fusion 4.2

Clarent Corporation (NASDAQ: CLRN) of Redwood City, CA, the developer of
Clarent ThroughPacket, is a global leader in providing intelligent,
software-driven products for new-generation, IP-based communications
networks. Commenting on today's announcement, Clarent CTO Mike Vargo said,
"Clarent's own products show how successfully ThroughPacket reduces
bandwidth requirements for VoIP traffic, and licensing this technology to
innovators like NMS will help solve the bandwidth issue for a broad
segment of service providers and companies using packet networks.", Inc. (OTC BB: PKPT), is a leading provider of
carrier-class VoIP media gateways, SS7 signaling gateways and VoDSL Access
devices. "MGCP support is essential for the IP-based media gateway
solutions we are pioneering," stated Jim Linley,'s VP of
engineering. "The big difference with Fusion is that the protocol is a
service within Natural Access, so we can implement MGCP using the same
development environment we would use for other telephony capabilities on
the NMS platform. This technical elegance allows developers to add MGCP
support quite readily-resulting in solutions that have expansive appeal to
service providers."

About Natural MicroSystems

Natural MicroSystems (NASDAQ: NMSS) is the technology leader supplying the
world's major networking and communication equipment suppliers with the
products and services required to create communications infrastructure,
applications, and services faster and at lower costs than ever before. The
Framingham, MA-based company designs, develops and supplies
network-quality hardware and software, and provides design and
customisation services. These enable the highly reliable and effective
creation, delivery and transport of voice and data, services and
applications on next-generation public and enterprise network

Deployed in more than 65 countries, NMS' products and technologies are at
the foundation of today's high-value communications systems and wireless
and wireline networks, including enhanced service platforms for packet and
circuit networks; access gateways for voice-over-IP (VoIP), voice-over-DSL
(VoDSL) and voice over fixed broadband wireless; IP media servers; voice
portals and Web-talk applications; virtual personal assistants; and Ecrm.
The company also provides platform solutions for converged applications in
packet networks, enabling carriers and service providers to deliver
differentiated services quickly and cost effectively - with guaranteed
levels of quality and service.

NMS has a long history of technology innovations that advance the rapid
growth of the communications industry worldwide, including breakthroughs
such as the first complete open IP gateway, the first complete open packet
media server and leadership in bringing open, scalable CompactPCI to the
telecommunications industry. More information about NMS is available at

Natural MicroSystems, Fusion, Natural Access, Convergence Generation and
PowerAccess are trademarks of Natural MicroSystems Corporation. Clarent
and ThroughPacket are trademarks of Clarent Corporation. Windows and
Windows NT are trademarks or registered trademarks of Microsoft
Corporation in the United States and/or other countries. Solaris is a
trademark or registered trademark of Sun Microsystems, Inc. in the United
States and other countries. All other product or corporate references are
trademarks or registered trademarks of their respective companies.

This release may contain forward-looking statements regarding NMS and
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, ability to introduce new products, ability to retain key
customers, changes in market conditions, government regulations, the
international communications industry, 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
NMS' and Clarent's periodic filings with the SEC.

For further information please contact:

Kim Polley/ Tracey Farrant

Brodeur Worldwide

Tel: 01753 790700

Email: kpolley/

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