Calix Chief Executive and Marketing Executives Speak at SUPERCOMM 2005; Company CEO Carl Russo Will Be a Featured Keynote Speaker at the USTA Luncheon.

CHICAGO -- Calix today announced that Carl Russo, chief executive of Calix; Frank Wiener, vice president of field marketing for Calix; and Geoff Burke, video solutions marketing director for Calix, will speak at three separate events associated with SUPERCOMM 2005. Calix is a leading supplier of telecommunications solutions that help local exchange carriers of all sizes simplify the delivery of voice, data, and video services to business and residential subscribers.

Carl Russo  Russo will be a keynote speaker at the United States
            Telecom Association (USTA) Telecom Leadership Conference
            Luncheon on June 7 at 12:00 p.m. CST at the Hyatt Regency
            McCormick Place in Chicago. Russo is on the USTA Board of
            Directors. USTA represents more than 1,200 telecom service
            providers of all sizes and has been at the forefront of
            positive change within the telecom industry for over a
            century. The USTA Board of Directors, which is made up of
            key industry executives from service providers and
            equipment suppliers, is responsible for setting the agenda
            for the USTA's legal, regulatory, and business development
            strategy on an annual basis.

What        Russo will present his vision of the "Communications
            Service Providers: Where's the Value-Add?" Russo will
            speak to the importance of a rigorous focus on broad,
            multi-faceted service delivery as one of the few viable
            strategies for communications service providers. This
            strategy applies irrespective of evolving regulatory
            developments and marshals rapidly developing technology
            innovations to leapfrog the breadth of offerings delivered
            by cable operators.

            For more information on the USTA Telecom Leadership
            Conference at SUPERCOMM 2005, please go to www.usta.com

Where       USTA Telecom Leadership Conference
            2233 S King Dr.
            Chicago, 60616

When:       Tuesday, June 7, 2005 from 12:00 p.m.-1:30 p.m. CST

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Frank
Wiener      Wiener will participate in Telephony's Voice over Internet
            Protocol (VOIP) Conference on June 6 at 1:30 p.m. CST at
            the Westin Michigan Avenue in Chicago, Illinois.

What        The track two session titled "Services Strategy & Profits:
            VOIP and the Triple Play" will discuss how the transition
            to VOIP will affect service providers' efforts to add
            voice into their triple-play offerings. The session will
            also explore the strategic role of IP voice in the bundled
            offering and the transitional challenges of moving
            residential voice services to the VOIP model.

            The panel will be moderated by Vince Vittore, executive
            editor of Telephony & Wireless Review, and will include
            panelists from Alltel, D&E Communications, and The Eastern
            Management Group.

            For more information on Telephony's VoIP Conference at
            SUPERCOMM 2005, please go to:
            http://www.shorecliffcommunications.com/voip05/program.asp

Where       Telephony's VoIP Conference
            The Westin Michigan Avenue-Chicago
            909 North Michigan Avenue
            Chicago, IL 60611

When        Monday, June 6, 2005, from 1:30 p.m.-2:30 p.m. CST

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Geoff
Burke       Burke will participate in the USTA IP Video Conference on
            June 6 at 12:30 p.m. CST at McCormick Place in Chicago,
            Illinois. Burke has written Chapter 2, titled "Video
            Service Opportunities," of USTA's reference guide on IP
            Video Implementation and Planning. The guide will launch
            at SUPERCOMM and will be available through the USTA
            bookstore.

What        The panel titled "Services -- Is the Future Now?" will
            discuss the rapid growth and rollout of services such as
            High Definition Television (HDTV), Video-On-Demand (VoD),
            and portable digital video recorders. The panel will also
            examine the impact of external factors, such as the Plug
            and Play agreement, as they relate to customers embracing
            these new services.

            Along with Burke of Calix, the panel will also include
            speakers from The Walt Disney Company, SBC, Wave7 Optics,
            and Scientific-Atlanta.

            For more information on the USTA IP Video Conference @
            SUPERCOMM, please go to:
            http://www.usta.org/index.php?urh=Supercomm_IPVideo_Agenda

Where       USTA IP Video Conference
            McCormick Place
            2301 S. Lake Shore Drive
            Chicago, Illinois 60616
            Room: S102

When        Monday, June 6, 2005, from 12:30 p.m.-2:00 p.m. CST

About Calix

Calix is the leading supplier of telecommunications solutions that help local exchange carriers of all sizes simplify the delivery of voice, data, and video services to business and residential subscribers. The packet-based Calix C7 platform provides extensive optical and metallic density, unprecedented access capacity and functional headroom, advanced management and provisioning capabilities, and broad service flexibility. The Calix C7 platform has been deployed in over 150 service provider networks throughout North America. More information about Calix can be found at www.calix.com.