Canadian Telecom Provider Deploys Solutions From Sonus Networks To Support Growing Pre-Paid Phone Service

Gold Line Leverages Sonus Networks' Network Border Switch for Secure, International Long Distance IP Peering

CHELMSFORD, Mass., June 7, 2006 – Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, announced today that Group of Gold Line (Gold Line), the largest prepaid long distance calling card provider in Canada, which services over 60 percent of the calling card market, has deployed a suite of Sonus' industry-leading IP Multimedia Subsystem (IMS)-ready solutions to support the increased demand for Gold Line's prepaid, private label and promotional calling cards.

Gold Line, which already carries more than 175 million minutes of long distance voice traffic per month, selected Sonus solutions because of their field-proven ability to scale quickly and efficiently in tandem with increasing amounts of IP-based voice traffic, and to allow service providers to rapidly expand into new markets. Gold Line currently leverages a distribution agreement with Western Union, Canada Post, Mac's stores, 7-Eleven, CIBC ATM, Shell, Petro Canada, Esso and over 100,000 independent outlets across North America to carry its popular CiCi Phone Card (CiCi), and/or co-branded calling card programs dramatically increasing its distribution channels across Canada, and has announced plans to expand into several European markets.

“Our goal is to make communications services readily accessible, particularly to newcomers to various regions, who are frequently reliant on pre-paid services,” said Mr. Vivian Clark, Chief Technology Officer, Gold Line. “Gold Line is committed to continuing its legacy of offering low cost, superior quality long distance voice service, and Sonus, which has industry's most robust, scalable, and secure platform, allows us to do just that.”

Gold Line has selected a full suite of Sonus' IMS-ready solutions, including the GSX9000™ Open Services Switch, the PSX™ Call Routing Server and the Sonus Insight™ Management System. In addition, Gold Line will deploy Sonus' Network Border Switch (NBS), which unlike traditional peering and security products such as Session Border Controllers (SBCs), delivers a unique solution that combines session control, PSTN gateway services and security into a single, high performance, carrier-class system.

In addition to the Sonus architecture, Gold Line is leveraging a prepaid calling application from Sonus' industry-leading Open Services Partner Alliance (OSPA). Sonus currently has one of the industry's largest and most successful interoperability partner programs, enabling service providers to take advantage of an extensive suite of IP-enabled voice applications and services.

“Gold Line's range of prepaid calling card services offers end users the flexibility that characterizes today's communications landscape, while their private label and promotional calling cards offer businesses unique branding opportunities,” said Hassan Ahmed, chairman and CEO, Sonus Networks. “With a complete IMS-ready architecture and a broad range of services from its OSPA, Sonus delivers a total solution for addressing this burgeoning market.”

The Sonus-based Gold Line network began to carry live traffic in May 2006.

About Group of Gold Line

Group of Gold Line www.goldlinegroup.com is Canada's largest and most reputable pre-paid service provider serving over 70% of the Canadian pre-paid market through its 100,000 points of sale across North America. Gold Line maintains a consistent combination of high quality, cost effective, user-friendly and innovative communications products and services, with outstanding Customer Service to respond to fast changing consumers' demands.

Established in 1993, Gold Line presently employs over 300 individuals, operates multiple branch offices and continues to grow its strong presence in many countries world-wide. Gold Line Group is comprised of four divisions that cooperatively compliment each other and is the only company of its kind in North America that retains complete ownership and control of all aspects of its business:

ARC PHONE CANADA INC.

Engineering, research and development division
Cisco-powered data centre and Siemens EWSD carrier -class switches
60,000 ports, capacity to terminate a billion minutes per month
Over 1,000 dedicated T1s to Major Canadian and international destinations
Originate calls from over 60 countries
Direct and international private lines to more than 20 countries
Toll-free access service from more than 30 countries

GOLD LINE TELEMANAGEMENT INC.

North America's largest prepaid long distance service provider
Terminates over 175 million long distance minutes/minutes worldwide
Full sales and marketing divisions including over 300 employees and a worldwide network value added resellers
Over 100 Gold Line and private label brands are distributed to over 100,000 points of sale worldwide

TELERESOLVE INC.

Services the group's call centre requirement with 7 days x 24 hour service in 9 languages
120 integrated work stations equipped with individual process management systems
Customized call answering to meet all client requirements with 80% of calls are answered within 60 seconds
With the recent migration of our customers care service to the voice over IP network, Gold Line is now capable of providing services internationally in any required language

CARD EXPRESS PRINTING INC.

Capable of printing over calling cards 1000,000 cards per day
In house design studio with multilingual designers
Heidelberg Speedmaster SM74 40” press
MAGMASTER magnetic stripe hot foil applicator
PROFOLD magnetic stripe reader, write, encoder and printer
Complete Web-to-Print solutions now enable our customers to design online, order and receive print material worldwide through recently launched www.glprint.com

Gold Line plans to expand its to offer the following services in the near future:

Travel Cellular Phone
North American Toll free service for residential, business & cellular
PIN Bank Point of sale activation & debit/credit services
Prepaid Visa & Master Card services
Prepaid Debit Card / Gift Card
e-line learning- world-wide online learning that offers the following services

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' Annual Report on Form 10-K, dated March 14, 2006 and Quarterly Report on Form 10-Q, dated May 8, 2006, both filed with the SEC, 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 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 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.