Nextiva Authorized Dealer – Access industry-leading VOIP technology trusted by thousands of businesses.
Business VOIP Phone Systems in Long Island & NYC – Reliable, Cloud-Based Communication
CSI Security delivers Nextiva VOIP phone systems and business communication solutions, giving you reliable calling, video conferencing, and messaging — all powered by the cloud.
or call (631) 421-2288 to secure your business
with CSI Security.
Phone Systems for Your Business
In today’s fast-paced world, your business phone system needs to do more than just make calls. At CSI Security, we provide cloud-based VOIP phone systems that allow businesses across Nassau County, Suffolk County, Queens, and New York City to stay connected anywhere, on any device. As an authorized Nextiva dealer, we deliver feature-rich, affordable, and scalable communication systems tailored to your business.
Why Choose CSI for VOIP Phone Systems?
Cloud-Based Flexibility – Make and receive calls from desk phones, computers, or mobile apps.
Scalable Solutions – From 2 lines to 200+, grow your phone system as your business expands.
Cost Savings – Lower monthly costs compared to traditional phone systems.
Our VOIP Phone Solutions
Cloud Phone Systems
Reliable communication powered by the cloud, eliminating the need for expensive on-premise PBX hardware.
Hosted PBX & Unified Communications
All-in-one calling, messaging, and video conferencing for seamless business communication.
Small Business VOIP
Affordable, easy-to-use solutions for restaurants, retail shops, offices, and growing businesses.
Enterprise VOIP Solutions
Scalable systems designed for multi-location businesses, call centers, and franchises.
Repairs & Upgrades
Still using an outdated phone system? CSI can help you transition from landlines or legacy PBX systems to a modern VOIP solution, while keeping your phone numbers, extensions, and call flows intact.
Industries We Serve
- Restaurants & Quick Service Chains
- Retail & Pharmacies
- Offices & Professional Services
- Warehouses & Logistics
- Schools & Healthcare Facilities
Customer Testimonials
Frequently Asked Questions
Q: Can I keep my current phone numbers?
Yes. We can port your existing numbers into your new VOIP system.
Q: Do VOIP phones work if the internet goes down?
Yes. Nextiva has call continuity features that reroute calls to mobile devices if your office internet is unavailable.
Q: Do you provide installation and training?
Yes. CSI provides onsite installation, configuration, and training for your team.
Q: Are VOIP systems more cost-effective than landlines?
Yes. Most businesses save 30–50% compared to traditional phone lines.
Upgrade your communication with cloud-based VOIP phone systems in Long Island & NYC.
Call us now at 631-421-2288
