Sonus Signs on Local Telco Systems Integrator IBIL as its Malaysian Partner, Establishes Regional Office in Kuala Lumpur 

WESTFORD, Mass., May 28, 2003 – Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure solutions for the new public network, today announced that it has appointed leading Malaysian telco systems integrator, IBIL, as its partner in Malaysia. Sonus also announced the establishment of a regional office in Malaysia.

"The voice over IP (VoIP) market in Malaysia is a very dynamic and rapidly growing sector," said Jack Tee, regional sales director, South Asia, Sonus Networks. "We see a lot of potential in this multi-million dollar market and with our new partner, IBIL, we aim to replicate in Malaysia the success we have had with service providers in other parts of Asia, such as Fusion Communications in Japan."

In 2001, Fusion Communications, Japan's first and premier IP-centric telecommunications carrier, deployed Sonus' full range of packet voice solutions as the foundation of their next-generation voice network. This win was recognised by the leading IT market analysis and positioning services firm Aberdeen Group as one of the most important VoIP deployments of 2001 and 2002. 

Sonus has selected IBIL to focus specifically on the local telecommunications operators sector, which includes both the wireless and fixed line markets. IBIL has a proven track record in implementing various products to the same service providers that Sonus is targeting in the region. With more than a decade of experience, IBIL has established its reputation in the telecommunications, networking and telecommunications infrastructure industry for high quality solution delivery, timely completion of projects and unsurpassed attention to customer service. IBIL has undertaken major projects for some of Malaysia's leading organisations, including Telekom Malaysia Berhad and Celcom Petronas Network (CPN), currently know as Petrofiber Network.

"Sonus is widely acknowledged as a market leader and world leader in carrier class VoIP packet solutions, and we see a lot of potential in working together for future projects," said Tan Sri Dato' Zaki Tun Azmi, chairman, IBIL. "We are extremely pleased with this partnership, and look forward to a lasting and successful relationship."

Sonus has established a regional office in Kuala Lumpur, which will enable the company to directly support its customers and partners in the country. The Kuala Lumpur office is located at Level 40, Tower 2 PETRONAS Twin Towers KLCC 50088 Kuala Lumpur, Malaysia. Tel: +60 3 2168 4468, Fax: +60 3 2168 4201.

About IBIL (M) Sdn Bhd

IBIL (M) SDN BHD is a leading provider of telecommunication, and energy solutions in Malaysia. IBIL is a recognized System Integrator. The company's services are focused around Network Planning and Design, System Integration and Project Implementation in the Telecommunication and the Power Distribution Industries. With over a decade of successful project implementation record, the company's continued leadership is focused on consistently high-quality, and responsive services to its customers. This has made IBIL one of the most trusted and competitive service providers in the industry. The company headquarter is located in Suite E-12-16 Plaza Mont' Kiara, No 2. Jalan Kiara, Mont' Kiara, 50480 Kuala Lumpur. Tel: 03-62031322. Additional information on IBIL is available at http://www.ibilmalaysia.com

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network. With its Open Services Architecture (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking, residential access and Centrex, tandem switching, and IP voice termination, as well as enhanced services. Sonus' award-winning voice infrastructure solutions, including media gateways, softswitches and network management systems, are deployed in service provider networks worldwide. Sonus, founded in 1997, is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

This release may contain projections or other forward-looking statements regarding future events or the future financial performance of Sonus 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 19, 2003 and filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. These risk factors include, among others, the adverse effect of recent developments in the telecommunications industry, the weakened financial position of many service providers, Sonus' ability to grow its customer base, dependence on new product offerings, market acceptance of its products, rapid technological and market change and manufacturing and sourcing risks. In addition, 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.

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