CORRECTING and REPLACING Calix Unveils CalixCompatible Solutions Assurance Program.

Business Editors/High-Tech Writers

CORRECTION...by Calix 

PETALUMA, Calif.--(BUSINESS WIRE)--June 15, 2004

In BW5501 issued June 15, 2004: Sixth graph, first sentence of release should read: Actelis Networks(R); Acterna; Akimbo Systems; Amino Communications Ltd.; BigBand Networks; Bitband; Broadstream Communications, Inc.; Broadxent, Inc.; Carrier Access (Nasdaq:CACS); CastleNet Technology Inc.; Comtest Networks Inc.;... (sted Actelis Networks(R); Acterna; Akimbo Systems; Amino Communications Ltd.; BigBand Networks; Bitband; Broadstream Communications, Inc.; Broadxent; Carrier Access (Nasdaq:CACS); CastleNet Technology Inc.; ComTest Technologies, Inc.;...)

The corrected release reads:

CALIX UNVEILS CALIXCOMPATIBLE SOLUTIONS ASSURANCE PROGRAM

Multi-vendor program allows service providers to ensure interoperability between components required to deliver advanced IP-based voice, data, and video services

Calix today launched the CalixCompatible solutions assurance program, a rigorous certification process designed to ensure smooth deployability of multi-vendor solutions. Specifically focused on promoting the deployment of advanced, IP-based voice, data, and video services, the CalixCompatible program provides wireline service providers with a valuable service: the certification of multi-vendor systems down to individual system release levels. In order to accomplish this, the program requires participants to submit solution elements to the CalixCompatible Lab, a large-scale test facility located in Petaluma, California. Calix lab personnel perform ongoing certification testing and conditionally make the results of this testing, including test scripts and system release levels, available to service providers via a secure web portal.

"Even though all of these solutions comply with similar standards, it is enormously helpful to service providers like Ringgold when a supplier steps forward and performs this level of certification testing," said Phil Erli, general manager at Georgia-based Ringgold. "The CalixCompatible program has allowed us to quickly and easily roll out advanced new IP-based services, such as switched digital video, to our subscribers."

According to Rick Johnston, Calix vice president of business development, "In order for programs like this to have real value to service providers, it is critical that they have strict and meaningful criteria for interoperability and that certification be applied down to specific system levels. Calix has invested heavily in lab infrastructure and support resources in order to deliver this value to our customers."

The CalixCompatible program includes two levels of participation: Certified and Affiliate. Certified partners submit solutions to the CalixCompatible Lab, develop joint test scripts, and provide regular system updates in order to ensure interoperability on an on-going basis. Affiliate partners develop to common standards and work cooperatively in service provider networks to enable smooth deployment.

Participants in the CalixCompatible program provide a broad range of solution elements enabling the delivery of advanced voice, data, and video services. Current CalixCompatible participants include:

Actelis Networks(R); Acterna; Akimbo Systems; Amino Communications Ltd.; BigBand Networks; Bitband; Broadstream Communications, Inc.; Broadxent, Inc.; Carrier Access (Nasdaq:CACS); CastleNet Technology Inc.; Comtest Networks Inc.; Comtrend Corporation; CopperCom; Entone Technologies; GoDigital(R) Networks Corporation; Harmonic Inc. (Nasdaq:HLIT); i3 micro technology; IMC Networks; Interphase Corporation (Nasdaq:INPH); Kasenna; Latens Systems Limited; MetaSwitch; Micromuse Inc. (Nasdaq:MUSE); MidStream Technologies(TM); Minerva(R) Networks; Myrio Corporation; Netopia, Inc. (Nasdaq:NTPA); Nortel Networks (NYSE/TSX:NT); Optibase Ltd. (Nasdaq:OBAS); Pedestal Networks; Skystream Networks(R); TANDBERG Television (Oslo:TAT); Thomson (Euronext Paris:18453, NYSE:TMS); Tollgrade Communications, Inc. (Nasdaq:TLGD); Tut Systems, Inc. (Nasdaq:TUTS); Vinci Systems Inc.; Westell Technologies, Inc. (Nasdaq:WSTL); Widevine Technologies(R); Wilcom; and XAVi.

The CalixCompatible program also incorporates joint problem escalation procedures and expanded training of Calix field operations technicians on partner solutions, all of which provides valuable assistance to service providers deploying certified CalixCompatible solutions. Customers of Calix are also able to make use of CalixCompatible lab facilities for custom interoperability testing.

About Calix

Calix is a leading supplier of telecommunications solutions designed to simplify all aspects of voice, data, and video service delivery to business and residential subscribers for local exchange carriers of all sizes. Providing extensive optical and metallic density, unprecedented access system capacity and functional headroom, advanced management and provisioning capabilities, and broad service flexibility, the packet-based Calix C7 platform has been deployed in over 120 service provider networks throughout North America. More information about Calix can be found at www.calix.com.

This press release contains forward-looking statements that are based upon management's current expectations and are inherently uncertain. Forward-looking statements are based upon information available to us as of the date of this press release and we assume no obligation to revise or update any such forward looking statement to reflect any event or circumstance after the date of this release. Actual results and the timing of events could differ materially from current expectations.