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AVICI SYSTEMS SCHEDULES Q207 EARNINGS RELEASE DATE AND TIME

N. Billerica, MA, July 11, 2007 — Avici Systems (Nasdaq: AVCI), today announced it will release financial results of its fiscal second quarter ended June 30, 2007, on July 19, 2007 and will host a conference call on July 19 at 8:30 a.m. EST, to be broadcast live over the Internet.

To participate via telephone, the dial-in number is 888-550-2358. Please call ten minutes prior to the scheduled conference call time. For live Webcasting, go to the Avici Web site at www.avici.com and access the investor relations section, clicking on either the live Webcast link or the microphone icon to listen.

The conference call will be archived on the Avici Web site. A replay will be accessible by telephone after 1:00 p.m., for approximately 48 hours afterward. To replay the call dial 800-475-6701 using the access code 879282.

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.

About Soapstone Networks
The Soapstone Networks solution is designed to enable carriers to bring orderly, predictable, business-driven behavior to networks, regardless of vendor or technology composition. It utlizes an SOA-based modular architecture that provides the agility and nimbleness to target different applications.

For more information contact:
Inna Vyadro
Director of Investor Relations
Avici Systems
978-964-2000
ivyadro@avici.com
 

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