VoIP Phone Systems

A Sole Focus on Telecom Technology

Hybrid Platform: Digital/VoIP Phone Systems

Founded in 1987, ESI has wasted no time making a name for itself in the business telecommunications world.

Award after award, ESI continues to strive in developing ground breaking products with advanced features and ease of use. ESI’s IVX series is Liberty’s best seller, and there’s no secret to its success. Extremely user friendly and loaded with features and functions, the IVX series is offered in five different classes guaranteed to satisfy businesses of every size and demand. Read more about ESI Business Telephones

For the Busy Office on the Move


The hustle and bustle of the small office can often be a client’s nightmare when trying to reach certain contacts.

Problem solved – the ESI-50L.

Like all ESI systems, the 50L makes it easy to keep in touch. Options such as “off premises reach me” allow those on the move to keep connected with their clients and the main office. Also, the 50L grows as your company grows and is VoIP ready for future technology, making this system a perfect solution for a growing company on the move.

For the Business with a VoIP Need


The 50L’s big brother is an excellent solution for growing companies with an immediate demand for VoIP. This new addition to ESI’s Communications Servers family offers all of the features and functions your company demands with the capability of adding linked remote sites, Remote IP phones for home users, softphones for road warriors, and a complete inter-office VoIP solution. The ESI-50 is a great way to take your company into the VoIP age while maintaining the PBX features and functions you know and love.

For the Business on the Verge


Picking up right where the ESI-50 leaves off, the ESI-100 is a converged IP and digital system that offers more room for expansion, extra features such as ACD groups, and the same powerful call control that has made ESI the industry leader that it is.

With the ESI-100, you open up to a plethora of communication server features such as a standard-based design, including SIP support, ESI’s Verbal User Guide, Six-Level, 100-branch auto attendant, and much more!

If your business is looking for a big solution at competitive pricing, make the easy choice – ESI-100.


For the Business Thinking BIG


The ESI-200 is everything you would expect and more in a telephone system. This converged IP and digital system is loaded with tons of features and functions, as well as an extended list of capabilities and programming options.


The ESI-600 is a converged IP and digital system loaded with tons all of the features and functions ESI is known for, as well as an extended list of capabilities and programming options, the ESI-600 is the idea solution for large multi-office situations, handling a big system situation with comfort and ease.


The biggest gun in the ESI arsenal, the 1000 series takes business communications to a whole new stratosphere. This converged IP and digital system does everything and anything pushing technological boundaries.

For the Business that can’t be held back!

IP Server 900

The innovative design of the IP Server 900 means that all vital business communications features you need are built-in— not added-on.

Whether you have many users and outside lines, just a handful of each, or something in-between, the IP Server 900 grows with you. ESI’s IP phones work from anywhere on your network. They also can go to remote sites with quality broadband service, so executives and others can work from home while still having access to the office phone system. Also, ESI options let you customize your IP Server 900 to fit your business, whether it’s with ESI Presence Management, ESI-Link multi-site networking, VIP 7 Softphone, ESI Media Management, ESI Mobile Messaging, or ESI Bluetooth Integration, there is little this system doesn’t offer.

IP Power, teamed with ESI conveniences. They make an unbeatable combination.