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Juniper Networks and Sonus Networks Team to Build Integrated Voice and Data Networks

Industry Leaders Pair Voice and Data Services for Complete Carrier IP Core Network Solution

Sunnyvale, CA and Westford, MA - May 2, 2001 - Juniper Networks, Inc. (Nasdaq: JNPR) and Sonus Networks, Inc. (Nasdaq: SONS), today announced they are working together to enable service providers to offer integrated voice and data over their existing infrastructures with the highest levels of performance, reliability, and quality of service. Through their joint sales and marketing alliance, Juniper Networks and Sonus are working together to deliver carrier-class solutions harnessing the latest innovations in MPLS/Traffic Engineering, service-aware routing, and differentiated services.

The two companies are actively engaged in building converged core network infrastructure for carriers worldwide, including service provider Zephion Networks. Zephion has deployed an IP MPLS nationwide backbone using Juniper Networks and Sonus equipment to offer packet telephony and network-based services, as well as integrated data-centric solutions for business customers.

"By working with Juniper Networks and Sonus, leaders in the development of the new public network, we're able to build out an extremely robust, scalable IP network that supports mission-critical business applications and adapts to increasing bandwidth demands," said Heidi Heiden, Zephion Chairman and CEO. "As the leading provider of a programmable Internet services delivery platform, Zephion Networks leverages the most advanced Internet technologies to provide differentiated, policy-driven Internet services to our customers."

"We're pleased to be partnering with Sonus Networks to help carriers like Zephion take advantage of the new IP infrastructure to realize their vision of delivering differentiated revenue generating services," commented John Riedel, vice president, business development, Juniper Networks.

The telecommunications industry is undergoing a major transformation, one in which service providers are deploying converged packet networks to support both data and voice traffic. The migration to the new public network has significant infrastructure implications for all carriers as they seek packet-based solutions that provide the levels of reliability, scalability, and quality of service required in the core of the network. The combination of Juniper Networks industry-leading Internet core routing technologies and Sonus' packet voice infrastructure solutions is allowing carriers to build robust, converged networks that meet the extremely high standards established by the public network over the past few decades. Moreover, the new public network, enabled by next-generation voice and data solutions, gives carriers the ability to develop and deliver a range of new services not previously feasible through separate data and voice networks.

"The development of the new public network creates significant opportunities for carriers to redefine their competitive positions," said Hassan Ahmed, president and CEO of Sonus Networks. "Both Juniper Networks and Sonus are keenly focused on developing products facilitating this major transition - Juniper Networks is recognized as the dominant vendor in core routing solutions, and Sonus pioneered the market for carrier-class packet telephony solutions. We look forward to working together to help our carrier customers deploy the next-generation networks that will support their business objectives."

About Zephion Networks

Zephion Networks, Inc. has created the first network platform capable of combining the cost and efficiency of IP with guaranteed performance. Zephion's world-class management and engineering team have experience in the design, protocol development, and deployment of the largest IP carrier network in the world. Zephion has built a national, legacy-free IP/MPLS network designed to provide programmable and differentiated, policy-based products and services such as network-based virtual private networks and QoS-enabled IP telephony services that are created and provisioned real-time. Founded in December 2000, Zephion is headquartered in Falls Church, VA.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice infrastructure products for the new public network. Sonus' solutions enable service providers to deploy an integrated network capable of carrying both voice and data traffic, and to deliver a range of innovative, new services. The Sonus Open Services Architecture™ (OSA) and award-winning Packet Telephony suite cut the time-to-market for competitive new service products, allowing carriers and third-party developers to expand market share and build important new revenue streams. Its highly scalable products fully interoperate with and extend the life and utility of today's public network. Sonus embodies in its management and staff decades of experience in developing carrier-class voice, data and multimedia solutions for implementation in the world's largest networks. Sonus, founded in 1997, is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

About Juniper Networks, Inc.

Juniper Networks, Inc. is a leading provider of purpose-built systems that meet the scalability, performance, density, and compatibility requirements of rapidly evolving, optically-enabled IP networks. The company's systems provide new IP infrastructure solutions for the world's leading service providers. Juniper Networks service, manufacturing teams, and IP engineers work closely with customers to build and support customer networks. The company is headquartered in Sunnyvale, California. For more information, please visit the Web site at https://www.juniper.net.

Juniper Networks is a registered trademark of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks may be the property of their respective owners.