Sonus Networks NXTcomm BOOTH #4215
Operax NXTcomm BOOTH #6922

Integration of Operax dynamic Bandwidth Management solutions with Sonus' Network Border Switch Enables Network Operators to Deploy TISPAN-Compliant Border Gateway Function (BGF)

WESTFORD, Mass. and STOCKHOLM, Sweden, June 18, 2007 – Sonus Networks (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, and Operax, the leading vendor of Network Service Quality control solutions, announced today at NXTcomm 2007, one of North America's largest communications industry trade shows, that they have entered into a non-exclusive partnership. As network operators look to leverage broadband as a service delivery vehicle for advanced applications such as IP Multimedia Subsystem (IMS)-based services and services that integrate voice, video and data, the joint solution facilitates faster service creation and superior service quality, essential to protecting the consumer experience. In addition, the ability to create and provision these new services effectively helps network operators realize new revenue streams through enhanced control of their network resources.

"Broadband is a revolutionizing force in the communications industry as it provides a platform on which network operators can deliver services that change the way people communicate," said Vikram Saksena, chief technology officer, Sonus Networks. "Sonus Networks is focused helping network operators maximize this opportunity by building out its next generation networking ecosystem through innovation across its solutions as well as on the integration of the industry's best third party products, such as the service quality-control solutions from Operax."

"We are proud to work with Sonus, a leading player in the next generation voice market. Operax has pioneered the development of standards-compliant Quality of Service solutions designed specifically to ensure the highest level of reliability and performance in multi-vendor networks," said Roberto Kauffmann-Dev, Operax Solutions Alliances Director. "Operax Bandwidth Management products key strength is to ensure sufficient end-to-end resources are reserved for all types of services and sessions across all components of the IP network. The combined Operax and Sonus solution is a robust platform for today's most demanding network operators that are looking to benefit from standards-based, cost-effective technologies for their non-IMS, pre-IMS and IMS network infrastructure."

As a result of the partnership, network operators will be able to seamlessly deploy Sonus' Network Border Switch (NBS) in combination with Operax Bandwidth Management products for resource and policy-based admission control (RACS), resulting in a TISPAN-compliant Border Gateway Function (BGF). The BGF provides control of media resources, such as voice and video, by providing services such as metering, policing, marking and gate control.

About Operax

Operax is an independent software vendor offering innovative products and solutions for dynamic Bandwidth Management and guaranteed Quality of Service (QoS) in IP-based networks.

Throughout the world telecommunications operators are seeking to maximize their Returns on Investment in Next-Generation Networks. In converged broadband networks, providing guaranteed Quality of Service is a key capability and essential for the successful commercial deployment and operation of new solutions, such as IPTV, VOIP and IMS-based services. For carriers seeking these capabilities today, Operax provides flexible Bandwidth Management solutions for real-time, end-to-end QoS Control.

Operax has made extensive contributions, and continues to participate, in the forums for next-generation network standards. The company been granted many patents for its technology and has many applications pending. Operax customers are network operators and service providers, along with defense organizations and leading telecommunications system vendors.

Founded in 2000, Operax is a privately held company with headquarters in Stockholm and offices in Washington DC, London, Rome, and Luleå - Sweden. The company is owned by Nordic Venture Partners, Innovacom, Nomura and Emano, along with its founders. For more information, visit www.operax.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 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 Sonus' Quarterly Report on Form 10-Q dated May 8, 2006, filed with the SEC, 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 the impact on the Company's financial statements or results, any tax liabilities or penalties, the Company's inability to timely report with the Securities and Exchange Commission, whether the Company will file its required SEC reports by June 26, 2007 and remain listed on the NASDAQ Global Select Market, regulatory actions 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.

The information in this press release is for informational purposes only and is subject to change at Sonus' sole discretion without notice. Sonus has no obligation or commitment to develop or deliver any future release, upgrade, feature, enhancement or function described in this release. The information is provided "AS IS," with all faults, and without any warranties whatsoever, express or implied, including, but not limited to, warranties of merchantability, performance, or fitness for a particular purpose.

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.