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Avici Systems Appoints Bill Leighton President and CEO

North Billerica, MA, April 28, 2005

Avici Systems Inc. (NASDAQ: AVCI), today announced that William J. Leighton has accepted the permanent position of President and Chief Executive Officer. Mr. Leighton was appointed interim CEO on November 15, 2004.

Mr. Leighton joined Avici's Board in May of 2004 upon retirement from AT&T where he spent 27 years at AT&T Labs and Bell Labs. Most recently, Mr. Leighton served as Vice President of Research, and previously as Vice President of Network Development, where he led the design and development of AT&T's IP and data networks and services.

About Avici Systems
Avici Systems Inc., headquartered in North Billerica, Mass., is a leading provider of purpose-built carrier-class routing solutions for the Internet. Avici's family of routers is designed to meet carrier requirements for the highest scalability, reliability and network availability, while lowering the total cost of building and operating their networks. The company's routing systems provide new IP solutions to some of the world's leading service providers. For more information, please visit us at www.avici.com.

This release contains information about Avici's future expectations, plans, and prospects that constitute forward-looking statements for purposes of the safe harbor provisions under the Private Securities Litigation Reform Act of 1995. Such forward-looking statements are subject to risks and uncertainties, which could cause actual results to differ materially from those anticipated. When used in this press release, the word "will", "expected" and other similar expressions are intended to identify such forward looking statements. Such risks and uncertainties include, but are not limited to, market acceptance of Avici products, services and enhancements, customer purchasing patterns and commitments, development of the market place, timely product development and enhancement, intensity of competition of other vendors, technological changes, reliance on distribution partners, risks associated with international expansion, and other risks set forth in Avici's filings with the Securities and Exchange Commission.

For more information contact:

   
Inna Vyadro
Director of Investor Relations
Avici Systems
978-964-2000
ivyadro@avici.com
  Paul Brauneis
Chief Financial Officer
Avici Systems
978-964-2000
pbrauneis@avici.com
 

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