WESTFORD, MA, January 13, 2009 – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in IP communications infrastructure, today announced a restructuring initiative to further reduce its workforce by approximately 40 people, or 4% of employees worldwide.

"We continue with our actions to ensure the business is the right size and aligned with the Company’s strategic direction," commented Richard Nottenburg, president and chief executive officer of Sonus Networks. "We are committed to investing in the business and driving profitable growth, as we continue to build category leadership and deliver innovative, market–leading technology to our customers."

The Company expects to incur restructuring charges for severance and related costs of approximately $750,000 to $850,000 on a pre-tax basis in the first quarter of fiscal 2009 in connection with this action and anticipates annual compensation-related cash savings of approximately $4.5 million to $5.0 million as a result of these reductions.

While Sonus is eliminating jobs in some areas of the business, it continues to hire in some geographies to support future business plans. The Company may initiate further actions as it continues to implement its plans to right-size and realign its operations.

The actions related to this restructuring initiative are expected to be completed in the first quarter of 2009.

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 Relations:
Lucy Millington
978-614-8240
lmillington@sonusnet.com

Investor Relations:
David Roy / Karin Cellupica
978-614-8253 / 978-614-8615
droy@sonusnet.com
kcellupica@sonusnet.com