North America's largest distributor to resell the complete Sonus portfolio; New agreement further extends the availability of Sonus products to communications providers

CHELMSFORD, Mass., September 6, 2006 – Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, and EMBARQ Logistics, a division of Embarq (NYSE: EQ), announced today that the two companies have entered into a distribution agreement whereby EMBARQ Logistics will resell the entire suite of Sonus' award-winning IP Multimedia Subsystem (IMS)-ready solutions throughout North America. EMBARQ Logistics, Embarq's deployment, distribution and logistics division, will now include in its product portfolio Sonus' products for the local and core IP telephony market.

“By partnering with EMBARQ Logistics, Sonus now has access to one of the most extensive national sales and distribution networks for network operators in North America,” said Hassan Ahmed, chairman and CEO, Sonus Networks. “With this distribution agreement, communications providers have unprecedented access to the latest advancements in IP-voice. Our solutions have been proven in some of the world's most demanding networks and EMBARQ Logistics is now bringing the power of these solutions to operators throughout North America.”

“We pride ourselves in providing our 1,400 customers the latest innovative and practical solutions. The end-to-end IP telephony platform we can now offer presents a compelling and powerful opportunity for network operators,” said Brad Clark, vice president of Marketing and Sales at EMBARQ Logistics. “Sonus' IMS-ready platform allows communications providers to roll out products that are as easy to use as traditional phone service, but with additional features that make the experience much richer. This is another example of our being able to offer our customers products that make sense both in the consumer and enterprise markets.”

“Service providers throughout North America are evolving their voice networks to IP to not only lower operational costs, but also to drive new services. Through the Sonus Networks and EMBARQ Logistics distribution agreement, service providers have greater access to industry-leading IP telephony solutions. This partnership has the ability to extend both companies' positions in the rapidly growing next-generation service provider market,” said Jeremy Duke, president and CEO, Synergy Research Group.

The Sonus Networks products and solutions covered under this agreement include:

• Sonus' Consumer Voice over Broadband (c-VoBB) bundle, which enables emerging service providers to rapidly deploy a pre-tested, field proven Voice over Broadband solution.
• Sonus' media gateway family the GSX9000™ and GSX4000™ Open Services Switch.
• PSX™ Call Routing Server, the ASX™ Feature Server.
• Sonus Insight™ Management System.
• Sonus' IMS-ready architecture currently supports a broad range of consumer applications, including Enhanced 911 (E-911), and offers service providers with a streamlined integration path for adding new services and applications.

About EMBARQ

Embarq (NYSE: EQ), headquartered in Overland Park, Kansas, offers a complete suite of common sense communications services. The company has approximately 20,000 employees and operates in 18 states. Embarq, which is expected to rank among the Fortune 500, is included in the S&P 500. For consumers, Embarq offers an innovative portfolio of services that includes reliable local and long distance home phone service, high-speed Internet, wireless, and Dish Network satellite TV - all on one monthly bill.

For businesses, Embarq has a comprehensive range of flexible and integrated services designed to help businesses of all sizes be more productive and communicate with their customers. This service portfolio includes integrated local voice and data services, long distance, Business Class DSL, wireless, enhanced data network services, voice and data communication equipment and managed network services.

Embarq believes that by focusing on the communities the company serves and by employing common sense and practical ingenuity, it is able to provide customers with a committed partner, dedicated customer service and innovative products for work and home. For more information, visit www.embarq.com.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of Voice over IP (VoIP) infrastructure solutions 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 Chelmsford, 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 the “Risk Factors” section of Sonus' Quarterly Report on Form 10-Q, dated May 8, 2006, filed with the Securities and Exchange Commission, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. Risk factors include among others: 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 announced review of its historical stock option grants and accounting, including any potential impact of the Company's financial statements or results, the Company's inability to timely report with the Securities and Exchange Commission, the Company's potential inability to meet NASDAQ requirements for continued listing, potential investigations or litigation arising out of the review or any restatement; risks associated with our international expansion and growth; consolidation in the telecommunications industry; and potential costs resulting from pending securities litigation against the company. 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.

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