WESTFORD, Massachusetts and STAINES, United Kingdom, February 17 /PRNewswire/ --

- Advanced Session Control Technology From Sonus Offers Enterprises 
Enhanced Capabilities, Improved Coverage and Reduced Network Congestion

Sonus Networks, (Nasdaq: SONS), a market leader in IP communications
infrastructure, today announced the MobilEnterprise FMC, a business services
solution which enables mobile and converged operators to respond cost
effectively to the demands of smart phone users in enterprises across the
world. This new solution enables operators to protect margins and reduce
network costs in an increasingly price competitive market.

By anchoring session control at the application layer, rather than the
session/bearer layer, Sonus has enabled device independent service mobility,
enabling the user to take full advantage of enterprise features and leverage
the growing usage of picocell technology to improve in-building coverage.
With many workers using the mobile phone as their primary communication tool
- inside the office or on the road - the ability to seamlessly connect is
paramount.

"Many mobile operators are looking for faster evolution paths that will
transform their networks from circuit based voice channels in combination
with packet data, to becoming wholly IP based," commented Shailin Sehgal,
vice president, marketing and product management at Sonus Networks. "This
application layer solution allows the end user to use the device of their
choice, while its hosted nature means that in-house management is no longer
required, providing lower cost service delivery, greater quality of service
and enhanced employee productivity. Seamless switching between the mobile and
fixed IP network also ensures that calls are made on the most cost effective
network while the reduced complexity means that the end user benefits from a
single bill."

MobilEnterprise FMC solution leverages Sonus' extensive Business Services
portfolio by extending integrated business group and VPN services, with
enhanced and super user services such as group hunting, group call pick up,
find me follow me, attendant console, call centre agent and unified messaging
as well as integration with Microsoft OCS/LCS and Sonus' Enhanced Service
Portal for the delivery of unified communications (UC), to both mobile
Centrex and IP Centrex devices.

As a part of the MobilEnterprise FMC solution, Sonus' MobilEdge(R)
Mobility Manager leverages its secure integration of wireless Pico, future
super Femto and WiFi (VCC) based Mobile Centrex devices with SIP based IP
Centrex and/or existing IP PBXs. In this way the Sonus MobilEdge Wireless
Access Node provides the mobile operator with good quality of service within
the enterprise coverage area as well as ensuring the optimal use of expensive
Macro network resources through off loading to an enterprise based IP radio
access network (e.g. Pico cell or WiFi).

About Sonus Networks

Sonus Networks, Inc. is a market leader in IP communications
infrastructure for wireline and wireless service providers. With its
comprehensive IP Multimedia Subsystem (IMS) solution, Sonus addresses the
full range of carrier applications, including residential and business voice
services, wireless voice and multimedia, trunking and tandem switching,
carrier interconnection and enhanced services. Sonus' voice infrastructure
solutions are deployed in service provider networks worldwide. Founded in
1997, Sonus is headquartered in Westford, Massachusetts. Additional
information on Sonus is available at http://www.sonusnet.com.

This release may contain forward-looking statements regarding future
events that involve risks and uncertainties. Readers are cautioned that these
forward-looking statements are only predictions and may differ materially
from actual future events or results. Readers are referred to Item 1A "Risk
Factors" of our Annual Report on Form 10-K for the year ended December 31,
2007 and all subsequent Quarterly Reports on Form 10-Q, which identify
important risk factors that could cause actual results to differ from those
contained in the forward-looking statements. Risk factors include among
others: the Company's ability to align its cost structure with market
conditions, the impact of material weaknesses in our disclosure controls and
procedures and our internal control over financial reporting on our ability
to report our financial results timely and accurately; the unpredictability
of our quarterly financial results; risks and uncertainties associated with
the Company's restatement of its historical stock option granting practices
and accounting including regulatory actions; actions that may be taken by
significant shareholders; risks associated with our international expansion;
and the impact the current global financial market conditions may have on the
telecommunications industry. Any forward-looking statements represent Sonus'
views only as of today and should not be relied upon as representing Sonus'
views as of any subsequent date. While Sonus may elect to update
forward-looking statements at some point, Sonus specifically disclaims any
obligation to do so, except as required by law.

Sonus is a registered trademark of Sonus Networks, Inc. All other company
and product names may be trademarks of the respective companies with which
they are associated.

For more information, please contact:

    Media Contact:                            EMEA Media Contact:
    Lucy Millington                           Lauren Bishop/Lucia Barbato
    +1-978-614-8240                           +44-(0)-20-7107-2479/2480
    lmillington@sonusnet.com                  sonus.team@catalysis.co.uk