Press Release

Redback Networks Achieves "Verizon Testing Partner" Certification Distinguished Status Based on Years of Testing in Real World Environment

SAN JOSE, CA, May 4, 2005 – Redback Networks Inc. (NASDAQ: RBAK), a leading provider of next-generation broadband networking systems, today announced that its SMS™ testing team was recognized by Verizon’s Systems Integration and Testing department as a “Verizon Testing Partner.” Redback Networks is one of only a handful of companies to achieve Verizon Testing Partner certification. Verizon awards this certification only to vendor product test teams that have fully demonstrated quality, reliability and processes necessary to provide deployment-ready products to Verizon. The status eases the path for future deployment of Redback products in Verizon’s broadband network infrastructure.

“It is a high honor to earn the Verizon Testing Partner certification and we see it as a direct reflection of our people and our products,” said Marco Wanders, chief marketing officer for Redback Networks. “We are pleased to receive the certification and look forward to working closely with Verizon.”

The Verizon Testing Partner Certification is based on Verizon’s testing experience with Redback’s SMS platform. SMS systems have been running in Verizon’s broadband network infrastructure since 2001. The systems have demonstrated very high reliability, very high levels of quality, and they conform to stated specifications.

About Redback Networks

Redback Networks Inc., a leading provider of next-generation broadband networking equipment, enables carriers and service providers to build Smart Broadband Networks that can deliver simplified, personalized, portable subscriber services to consumers and businesses. The company's carrier-class, consumer-scale SmartEdge Router and Service Gateway platforms for Consumer IP combine subscriber management systems and edge routing and, in conjunction with the NetOp™ Element and Policy Manager platform, provide a powerful, flexible infrastructure for managing both subscribers and value-added services.

Founded in 1996 and headquartered in San Jose, CA, with sales and technical support centers located worldwide, Redback Networks maintains a growing and global customer base of more than 500 carriers and service providers, including major local exchange carriers (LECs), inter-exchange carriers (IXCs), PTTs and service providers. For more information, visit Redback Networks at www.redback.com.

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REDBACK and SmartEdge are trademarks registered at the U.S. Patent and Trademark Office and in other countries. SMS and NetOp are trademarks of Redback Networks Inc. All other products or services mentioned are the trademark, service marks, registered trademarks or registered service marks of their respective owners.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995

The statements contained in this press release that are not purely historical are forward-looking statements within the meaning of Section 21E of the Securities and Exchange Act of 1934, as amended, including statements regarding Redback Network’s expectations, beliefs, intentions or strategies regarding the future and including, without limitation, statements regarding future deployments of Redback equipment by Verizon, the continued reliability of Redback systems and the ability of Redback Networks to continue to work closely with Verizon. All forward-looking statements included in this document are based upon information available to Redback Networks as of the date hereof, and Redback Networks assumes no obligation to update any such forward-looking statements. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. These risks and other risks relating to Redback Network’s business are set forth in the documents filed by Redback Networks with the Securities and Exchange Commission (SEC), specifically the most recent report on Form 10-K, Form 10-Q, Form 8-K, and amendments thereto, and the other reports filed from time to time with the SEC.