Bethpage, NY, June 2, 2004 — Cablevision Systems Corporation (NYSE: CVC) today announced that it has added a number of significant feature enhancements to its Optimum Voice digital voice-over-cable service, including enhanced voicemail, access to directory assistance (411), and an advanced user-friendly Web portal that enables customers to listen to voicemail messages, manage settings, easily forward calls and review detailed calling history. Earlier this year, Cablevision began offering new customers a whole-house wiring option as part of the free installation, which delivers dial-tone to all existing wall jacks within the home.

With nearly 71,000 customers as of March 31, Optimum Voice is the fastest-growing and most widely-deployed digital voice-over-cable service in the nation. Optimum Voice became available across Cablevision's service area of nearly 4.4 million homes late last year, and during the first three months of 2004 added an average of 3,200 new customers each week.

"With Optimum Voice, we are creating a value-priced and feature-rich voice service that goes far beyond anything available today from traditional wire-line telephony providers or start-up services that route calls over the public Internet," said Patricia Gottesman, Cablevision's senior vice president of consumer product management and marketing. "These significant enhancements further improve a reliable, high-quality voice service that is already experiencing breakaway consumer acceptance."

Optimum Voice offers unlimited local, regional and long-distance calling across the U.S. and Canada for a flat rate of $34.95 per month. The service also includes six custom calling features: Caller ID, Call waiting, Call return (*69), three-way calling, Call forwarding and Enhanced voicemail. Optimum Voice also provides fully functioning E-911 service and is CALEA compliant. Optimum Voice calls are carried over Cablevision's own fully-upgraded network, not the public Internet, and the voice packets are prioritized to ensure a quality of service that cannot be matched by Internet phone services.

The new "My Optimum Voice" Web portal allows customers to easily forward incoming calls to another number and interactively view their calling history, which is fully sortable by billing period, state, most frequently dialed numbers or all calls to a specific number. The portal is accessible at www.OptimumVoice.com.

By simply logging onto the portal customers can also manage their enhanced voicemail options, which include listening to voice messages online from anywhere in the world, routing voicemail messages to up to three e-mail addresses, and programming the service to be paged or phoned when an urgent message is received.

"This advanced, user-friendly Web portal is a perfect example of our unique ability to integrate voice and data services in new and functional ways that offer real consumer benefits," Gottesman said. "The presence of a DOCSIS modem in our digital set-top boxes will allow future integration of voice and data with our digital cable service as well. We are only scratching the surface in terms of where our consumer services can go, and we will continue to leverage the enormous capacity of our network to deliver compelling value and functionality to our expanding customer base."





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