Sonus SBC 5100 and Sonus SBC 5200 Certified in Microsoft's Unified Communications Open Interoperability Program for Microsoft

  Sonus SBC 5100 and Sonus SBC 5200 Certified in Microsoft's Unified
  Communications Open Interoperability Program for Microsoft Lync Server 2010

 Sonus Session Border Controllers Enable Smooth Migration to SIP Trunking and
 Tested to Work Seamlessly With Microsoft's Unified Communications Solutions

Business Wire

WESTFORD, Mass. -- August 22, 2012

Sonus Networks, Inc (Nasdaq: SONS)

Key Takeaways:

  *Announcement affirms Microsoft Lync is compatible with the market’s
    fastest-growing provider of Session Border Controllers (SBC).
  *Certification assures enterprises and service providers that the Sonus^®
    SBC 5000 family has been tested to interoperate with Microsoft Lync.
  *The Sonus SBC 5000 portfolio includes the Sonus SBC 5100, which delivers
    from 250 to 10,000 sessions and the Sonus SBC 5200, which supports 64,000
    sessions on a single server.

Sonus Networks, Inc (Nasdaq: SONS), a global leader in SIP communications,
today announced that the Sonus SBC 5000 series of session border controllers
(SBC) has been tested and certified in Microsoft Corp's Unified Communications
Open Interoperability Program for Lync Server 2010. The Sonus SBC 5000 series
includes the Sonus SBC 5100, which delivers 250 to 10,000 sessions, and the
Sonus SBC 5200, which supports 64,000 sessions on a single server. By
achieving this certification, service provider, enterprise customers and
resellers can be confident that Sonus SBC 5000 series products interoperate
with Microsoft’s unified communications solutions featuring Lync Server 2010.

By deploying a Lync-based unified communications solution with Sonus SBCs, an
enterprise can begin leveraging the benefits of real-time communications and a
simplified network topology without replacing their legacy PBX solution. Sonus
SBCs provide secure access to SIP trunking, which should enable enterprises to
reduce costs and deliver new applications (such as unified communications and
video) across their entire network. SIP trunking, trunking consolidation and
the move to VoIP can reduce traditional enterprise telecom bills by up to 75%.
The Sonus SBC portfolio is the fastest-growing on the market for 2011
according to industry analyst Infonetics (“Infonetics Research Service
Provider VoIP Equipment and Subscribers,” 4Q11 report) - growing 4x faster
than the market average.


"The Sonus SBC 5000 series provides a great option for combining Microsoft
Lync into a legacy IP telephony infrastructure and activating the full suite
of Microsoft Lync voice communications capabilities," said Ashima Singhal,
Lync Group Product Manager, at Microsoft Corp. "In particular, Sonus’
strengths in interworking allow enterprises to take advantage of their legacy
voice applications infrastructure and use SBCs to enable a smooth migration to
SIP trunking and help create a truly unified communications network centered
on Microsoft Lync."

“The formal certification of the Sonus SBC 5000 portfolio helps ensure that
service providers and enterprises can reap the benefits of SIP-based
applications like unified communications in a seamless manner as they deploy
Microsoft Lync,” said David Tipping, Vice President and General Manager of SBC
at Sonus.”

Other Facts:

  *The “2012 SIP Trunking State-of-the-Market Report” by Webtorials
    commissioned by Sonus found that the move to SIP Trunking can save on
    average 33% versus traditional solutions.
  *A SIP-based unified communications infrastructure can reclaim 23% of the
    productivity lost on inefficient communications in large enterprises, or
    1.21 hours per employee per day, as noted in the '2012 Economic Impact of
    SIP in the Enterprise' State of the Market report by Sonus and Webtorials

Additional Resources:

  *Sonus recently announced the first-edition of Session Border Controllers
    For Dummies reference book in partnership with John Wiley & Sons, Inc.
  *More information on the Sonus SBC 5100
  *More information on the Sonus SBC 5200


Sonus Networks, SONS, SBC 5100, SBC 5200, Microsoft Lync, Webtorials, IT
priorities, IT cost savings, session border controller, SBC, SIP trunking
services, IPsec, media transcoding, IPv6 interworking, Unified Communications,
UC, Cloud VoIP communications, Session Management, employee productivity,
enterprise communications

About Sonus Networks

Sonus helps the world’s leading communications service providers and
enterprises embrace the next generation of SIP-based solutions including VoIP,
video and Unified Communications through secure, reliable and scalable IP
networks. With customers around the globe and 15 years of experience
transforming networks to IP, Sonus has enabled service providers and
enterprises to capture and retain users and generate significant ROI. Sonus
products include session border controllers, policy/routing servers,
subscriber feature servers and media and signaling gateways. Sonus products
are supported by a global services team with experience in design, deployment
and maintenance of some of the world’s largest and most complex IP networks.
For more information, visit or call 1-855-GO-SONUS.

Important Information Regarding Forward-Looking Statements

The information in this release may contain certain forward-looking statements
within the meaning of the U.S. Private Securities Litigation Reform Act of
1995 regarding future events that involve risks and uncertainties. Although
Sonus believes that its expectations are based on reasonable assumptions,
readers are cautioned that these forward-looking statements are only
predictions and are subject to inherent uncertainties, risks and changes in
circumstances that are difficult to predict. All statements other than
statements of historical facts contained in this report are forward-looking
statements. Our actual results may differ materially from those contemplated
by the forward-looking statements. For further information regarding risks and
uncertainties associated with Sonus’ business, please refer to the
“Management’s Discussion and Analysis of Financial Condition and Results of
Operations” and “Risk Factors” sections of Sonus’ filings with the Securities
and Exchange Commission. Any forward-looking statements represent Sonus' views
only as of the date on which such statement is made, 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 Networks
Wendy Tullo, +1 972-301-4978
Lois Paul & Partners
Anastasia Efstratios, +1 617-986-5873
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