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     IVX E-Class Brochure (PDF) IVX E-Class

IVX E-Class User Guide (PDF)


Loaded with advanced capabilities yet amazingly easy to use, ESI’s patented E-Class All-In-One Phone Systems give your business the power to present your most professional side to your customers.

Big features; big capacities

Each E-Class phone system combines multiple first-rate, feature-rich systems into one tightly integrated unit:

And, depending on the system and configuration you select with the help of your ESI Reseller, an E-Class system can handle the communications needs of bigger organizations:

— but friendly

Each ESI E-Class phone system says, “Good morning.” It teaches you how to use and program it. It reminds you to change your personal greeting after a trip. And it stands by, ready to assist you whenever you need help. There are several different models of ESI Feature Phones; each is a compact, attractive addition to any desk, designed to simplify your telecommunications. Here are just two examples:

And each ESI IP Feature Phone* works with either IP E-Class or properly equipped IVX E-Class (or IVX X-Class) systems, making it simple for an IVX E-Class system to migrate to an IP E-Class or IVX X-Class system if you desire.

Easy to choose; easy to use

Any of these E-Class All-In-One Digital Phone Systems is an easy choice over other phone systems. Its ease of use and feature-richness reduces staff frustrations, increases productivity and enhances your corporate image. And an E-Class system’s unique integration provides call processing efficiency and cost savings previously impossible.

The Details:


System features

Voice mail features

Auto attendant features

Station features

Programmable feature keys

The programmable feature keys can be programmed as follows:

Analog extension ports

Up to 30 analog extensions (28 on IVX) can be programmed, based on the number of cards installed in the system. The ports can be defined as:


* IP-related features standard on IP E-Class, and optional on IVX E-Class. For more information, consult your ESI Reseller.

** Requires Caller ID service from your telephone service provider.

*** Requires use of ISDN Primary Rate Interface (PRI) line.

****Configuration specs = CO (Central Office) outside lines × ESI Feature Phones × analog ports.