Correction to Webcast From Investor Conference

PETALUMA, Calif.--(BUSINESS WIRE)-- On Tuesday, June 8, 2010, Calix, Inc. (NYSE:CALX) conducted a live webcast at the UBS Global Technology and Services Conference, which included a discussion of Calix's customers. During the live webcast, Calix commented that one of the 20 largest U.S. Incumbent Local Exchange Carriers, Comporium Communications, had agreed to become a customer of Calix, which was incorrect.

The webcast was previously announced in a press release and broadly accessible to the public. An audio replay of the webcast is available on the investor relations section of Calix's website at http://investor-relations.calix.com for approximately 30 days. The audio replay of the webcast has been edited to correct the error noted above.

About Calix

Calix is a leading provider in North America of broadband communications access systems and software for copper- and fiber- based network architectures that enable communications service providers to connect to their residential and business subscribers. Calix enables communications service providers to provide a wide range of revenue-generating services, from basic voice and data to advanced broadband services, over legacy and next-generation access networks. The Calix Unified Access Portfolio helps these companies to transform their legacy and mixed protocol access networks to fiber and Ethernet. Calix has shipped over six million ports of its Unified Access Infrastructure portfolio to more than 500 North American and international customers, whose networks serve over 32 million subscriber lines in total. For more information, visit the Calix website at www.calix.com.

    Source: Calix, Inc.

Released June 9, 2010