[April 25, 2012]

PrimeTel Selects Sonus for New VoIP Platform

Sonus Networks (Nasdaq: SONS), a global leader in SIP communications, today announced that PrimeTel PLC has selected Sonus to provide its next-generation, end-to-end VoIP network solution. PrimeTel is the leading alternative service provider in Cyprus, with triple- and quad-play services aimed at businesses and high-usage residential subscribers. A new customer for Sonus, PrimeTel also offers wholesale Voice over IP (VoIP) interconnect services to other service providers and carriers throughout Europe and the Middle East.

The Sonus network will replace PrimeTel's existing VoIP network and allow the service provider to increase its market share by delivering services such as SIP trunking, triple-play and quad-play bundles-marketed as Mobile3play and Mobile4play-with a higher degree of reliability and quality. Sonus was selected for its ability to deliver an end-to-end VoIP network solution that would be easy to manage, upgrade and monetize while providing robust security and interoperability. At the core of the new PrimeTel network will be the industry-leading SBC 9000™ Session Border Controller, Sonus GSX™ Series Softswitches and the ASX™ Telephony Feature Server.

Quotes:

"We were looking for a strategic partner to build a robust and future-proof network, one that will drive customer loyalty and allow us to offer new value-added services," said Steve Lewis, General Manager of Technology at PrimeTel. "Sonus was the one firm capable of providing an end-to-end solution with SIP trunking, session border control, subscriber voice services, PSTN interworking and network management. Having only one partner for all network and service elements greatly improves our operational efficiency so we can focus on meeting the needs of our customers."

"PrimeTel has done an excellent job of distinguishing itself in a competitive EMEA market by broadening its horizons through wholesale services and, most recently, its Mobile4play services," said Adrian Patterson, Vice President of EMEA, Sonus. "We look forward to helping PrimeTel as it transitions its network to support voice, video and data and are excited to play a part in what promises to be a very bright future for PrimeTel."

Other Facts:

• The Sonus high-density multimedia gateway is the industry's most trusted TDM/IP media switch, powering four of the world's five largest voice networks
• Sonus' Hybrid Circuit/Session Border Controller platform is unique in the industry in that it allows TDM-based service providers to easily migrate to an all-IP network
• Across the globe, Sonus enables more than 5,854 sessions per second and counting
• Sonus Networks (News - Alert) is the fastest-growing provider of SBC solutions as reported by Infonetics (News - Alert) Research ("Service Provider VoIP Equipment and Subscribers," 4Q11 report)

• Sonus SBC 9000™ Session Border Controller
• Sonus GSX™ Series Softswitches
• Sonus ASX™ Telephony Feature Server
• Sonus is Fastest-Growing SBC Vendor in Service Provider Market - New Infonetics Research Report Shows Sonus SBCs Growing Almost 4x Faster Than the Market Average
• www.sonus.net
• www.primetel.com.cy/en

Keywords:

Sonus, SONS, PrimeTel, IP-based network solutions, VoIP trunking, triple-play, quad-play, Cyprus, hosted video, Mobile3play, Mobile4play, SIP trunking services, VoIP, Cloud VoIP communications, Unified Communications, UC, IP, TDM, SBC, Session Border Controller, Session Management, SBC 5200, SBC 9000, GSX (News - Alert), PSX, ASX, SGX, EMS, softswitch, centralized policy, routing server, telephony feature server, signaling gateway, DataStream Integrator, billing solution, management system, media server.

About PrimeTel:

PrimeTel PLC is the largest private telecommunication company in Cyprus that offers and develops Voice, Data and Video services. The company owns and operates a truly regional network, spanning across Cyprus, Germany, Greece, Russia and the United Kingdom, providing city-to-city connectivity, data communications, fiber optic fixed network infrastructure and IP-based services between key European and Middle East markets. PrimeTel is one of the few telecommunications operators in the region that can provide a full spectrum of connectivity and services.

As the first MVNO operator in Cyprus, PrimeTel has recently launched Mobile telephony services, becoming the first telecommunications company in Cyprus able to offer Quad-Play services (Fixed Telephony- Internet-TV- Mobile Telephony). For more information please visit www.primetel.com.cy.

About Sonus Networks

Sonus Networks, Inc. is a leader in IP networking with proven expertise in delivering secure, reliable and scalable next-generation infrastructure and subscriber solutions. With customers in over 50 countries across the globe and over a decade of experience in 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 www.sonus.net 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 Networks 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. Sonus' actual results may differ materially from those contemplated by the forward-looking statements. Such forward-looking statements may relate to, among others, expected growth rates, future business prospects and market conditions. Such forward-looking statements do not constitute guarantees of future performance and are subject to a variety of risks and uncertainties that could cause actual results to differ materially from those anticipated. These include, but are not limited to: the timing of Sonus' recognition of revenues; the ability to recruit and retain key personnel; difficulties supporting Sonus' new strategic focus on channel sales; difficulties expanding Sonus' customer base; difficulties leveraging market opportunities; difficulties providing solutions that meet the needs of customers; market acceptance of Sonus' products and services; rapid technological and market change; the ability to protect intellectual property rights; the ability to maintain partner, reseller, distribution and vendor support and supply relationships; higher risks in international operations and markets; the ability to hire and retain employees; the impact of increased competition; currency fluctuations; litigation; changes in the market prices of Sonus' common stock; actions taken by significant stockholders; failure or circumvention of Sonus' controls and procedures and other risks and uncertainties described more fully in documents filed with or furnished to the Securities and Exchange Commission by Sonus, including in Part I, Item 1A "Risk Factors", and Part II, Item 7 and Item 7A "Management's Discussion and Analysis of Financial Condition and Results of Operations", and "Quantitative and Qualitative Disclosure about Market Risk" in Sonus' most recent Annual Report on Form 10-K, and in Part I, Items 2 and 3 "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Quantitative and Qualitative Disclosures About Market Risk", and Part II, Item 1A, "Risk Factors", in Sonus' quarterly reports filed thereafter.

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 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.

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