New Optimum Online business customers only. Customers must maintain both services for promotional period to receive promotional pricing. As of the 13th month you will begin to be billed at the regular rates. May not be combined with any other offer. Installation fee applies. OPTIMUM VOICE is a cable-modem service available to Optimum Online customers. Up to 24 lines available at an additional monthly cost per line and requires multi-line modem. 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, Puerto Rico and the U.S. Virgin Islands, Call Forwarding and Find Me limited to continental U.S. Certain calling features require customer activation via My Optimum Voice. Without battery backup, 911 will not operate if you lose power. 911 will not operate if your voice service or broadband connection is disconnected or disrupted. New address must be provided to Optimum before modem is moved for 911 service to function properly. Optimum does not support use of Optimum Voice 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. OPTIMUM ONLINE: Minimum systems requirements apply. 30-DAY MONEY BACK GUARANTEE: applicable to new customer installations for recurring service fees and initial installation charges if service is terminated and all equipment is returned within 30 days of install. Upgrades not entitled to the 30-day money back guarantee. Other restrictions may apply. Where available.