KDDI Global Chooses Sonus Networks for Migration to Next Generation Network to Drive...

KDDI Global Chooses Sonus Networks for Migration to Next Generation Network to
Drive Business Expansion
KDDI Global Brings High Quality Services to the Global Wholesale Market

WESTFORD, Mass., July 30 /PRNewswire-FirstCall/ -- Sonus Networks, Inc.
(Nasdaq: SONS), providing network transformation through IP communications
technology, today announced that KDDI Global, part of KDDI Corporation a
global tier 1 telecommunications wholesale carrier, is using a Sonus IP-based
network to support the expansion of its business into the US, EMEA and across
ASIA.

The network, operated by KDDI Global, is now carrying approximately 100
million voice minutes per month, serving four cities around the world, in Los
Angeles, London, Osaka and Tokyo.

The next generation IP-based network enables greater capacity and efficiency
leveraging the platform's centralized routing, diverse media support and
secure border control for cost effective IP peering. The Sonus Global
Services team worked alongside KDDI Global to implement a SIP core to manage
the legacy TDM and new IP voice traffic on the same network.

"The Sonus based network has proven to be a robust, reliable and scalable
solution for KDDI in Japan for three years," commented Daichi Nozaki,
president and COO at KDDI Global. "The professional services team at Sonus
helped us to get the network into service and carry traffic within a matter of
months. We expect our business to grow over the next five years and we know
the Sonus network can evolve to meet our customer needs."

KDDI Corporation has been a Sonus customer since 2005 and within Japan has
implemented the Sonus GSX9000((TM)) Media Gateway, the PSX( (TM)) policy
routing server and the Sonus Insight Element Management System. Leveraging the
flexible, robust Session Initiation Protocol (SIP), KDDI offers on-net calling
services, as well as IP-to-PSTN and PSTN-to-IP calling, on the Sonus
infrastructure.

"Sonus and KDDI Corporation have enjoyed a successful relationship for over
four years," commented Guru Pai, senior vice president and general manager at
Sonus Networks. "KDDI Global have taken advantage of the value to be gained
from Sonus technology, and working closely with Sonus professional services to
prepare for its network expansion. We are proud that our solutions have proven
to be a robust, reliable and scalable platform for KDDI across the world."

About KDDI Global
KDDI Global, also known as KGL, is the formation of a KDDI America
majority-owned strategic initiative between KDDI America and Asia Access
Telecom. With KDDI America's financial resources and AAT's operational
strengths, KGL will quickly become a global Tier 1 telecommunications carrier,
offering quality services at competitive prices in the wholesale
telecommunications market.

About Sonus Networks
Sonus Networks Inc., providing network transformation through IP
communications technology, is leading the evolution of communications networks
to support the multi-device demands of today's digital lifestyle. Sonus
solutions and services enable fixed, mobile and cable operators to gain
session awareness and deliver multi-media capabilities essential to adding
value and expanding their customer and subscriber base. Through standards
based interoperable solutions and services, Sonus extends the investments made
in traditional networks by enabling operators to seamlessly migrate to next
generation technology and deliver the secure, reliable, scalable and
cost-effective network needed to grow their business. For more information
visit 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. For a discussion of the risks and
uncertainties which could cause actual results to differ from those contained
in the forward-looking statements, see "Risk Factors" in our Annual Report on
Form 10-K for the fiscal year ended December 31, 2008 and Quarterly Report on
Form 10-Q for the quarter ended March 31, 2009. Risk factors include among
others: the unpredictability of our quarterly financial results; risks and
uncertainties associated with the Company's previous 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:

Sonus Media Relations RacePoint Group for Sonus
Lucy Millington Shannon Breen/Katie Traut
978-614-8240 781-487-4600
lmillington@sonusnet.com sonus@racepointgroup.com

SOURCE Sonus Networks, Inc.

Media Relations: Lucy Millington of Sonus Networks, Inc., +1-978-614-8240,
lmillington@sonusnet.com, or Shannon Breen or Katie Traut, both of RacePoint
Group for Sonus, +1-781-487-4600, sonus@racepointgroup.com