Calix Conducts Large-Scale, Multi-Vendor IPTV / VOIP Demonstration with CalixCompatible Partners at SUPERCOMM 2005.

WHO:    Calix today announced it will showcase live demonstrations
           of IP-based voice, data, and video services delivered via
           the Calix C7 multiservice access platform at the SUPERCOMM
           2005 conference. The demonstrations incorporate products
           from multiple CalixCompatible partners that have passed a
           rigorous certification process to ensure interoperability
           among components required to deliver advanced IP-based
           voice, data, and video services.

           A number of CalixCompatible partners will participate in
           the demonstrations, including Nortel, a global leader in
           transforming carrier networks from circuit to packet,
           CopperCom, which provides innovative, next-generation
           softswitch solutions, and MetaSwitch, the leading vendor of
           Class 4/5 softswitch solutions. Both vendors have
           demonstrated H.248 interoperability between their solutions
           and the Calix C7.

   WHAT:   The live demonstrations -- which can be seen at Calix's
           booth #51000 -- will include IPTV over ADSL2+, H.248 voice
           over IP (VOIP), HDTV over ADSL2+ and FTTP, video on demand
           (VOD) using the bandwidth reservation protocol (BRP), and
           switched video services over both ADSL2+ and fiber to the
           premises (FTTP) broadband passive optical network (BPON)
           with a variety of optical network terminal (ONT) units,
           including the Siemens BPON family of solutions.

           The following CalixCompatible suppliers will participate in
           the demonstration: Amino (www.amino.com), Entone
           (www.entone.com), i3 micro (www.i3micro.com), Games4TV
           (www.iacta.com), Myrio (www.myrio.com), Nortel Networks
           (NYSE:NT) (TSX:NT) (www.nortelnetworks.com), Tut Systems
           (Nasdaq:TUTS) (www.tutsystems.com), VidiTel
           (www.viditel.com), Vinci Systems (www.vincisystems.com),
           Wegener (www.wegener.com), Westell (Nasdaq:WSTL)
           (www.westell.com), and Xavi (www.xavi.com).

   WHERE:  SUPERCOMM 2005
           Calix booth # 51000
           South Hall
           McCormick Place
           Chicago, IL

   WHEN:   Monday, June 6-Thursday, June 9, 2005

ABOUT CALIX

Calix is 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.