New Optimum Online business customers only. Optimum Voice for business is a cable-modem service available to Optimum Online for business customers. Up to eight lines available at an additional monthly cost per line. Battery backup included. Additional modems available at additional monthly cost. Upon cancellation of business services, customer must return modem and battery backup or be subject to a non-return fee of $100. Unlimited calling limited to U.S., Canada and Puerto Rico, and call forwarding to continental U.S. Certain calling features require customer activation via My Optimum Voice. E911 service requires that customer provide notification to Cablevision if cable modem is moved to a different address. Cablevision does not support use of Optimum Voice for business as a connection between customer's alarm system and the central monitoring services for all Fire Alarms and High Security Grade-A type business security alarm systems. Customer must maintain alternate phone connection for such connections. Speed claim based on Optimum Online running at 15 Mbps, Optimum Online Boost running at 30 Mbps and phone company High Speed Internet running at 3 Mbps. Actual speeds may vary. Where available. Pricing, terms and offerings subject to change and discontinuance without notice. May not be combined with any other offer. All trademarks and service marks are property of their respective owners.