About ESI

ESI is a privately held corporation, based in Plano, Texas (just outside Dallas), known for its high-efficiency, reasonably priced business communications systems, such as ESI C-Plus. ESI products have earned numerous awards from industry publications. ESI targets its products at offices of various sizes, marketing its products through a diverse Reseller organization that stretches across the United States.

ESI products are easy to install, easy to understand, and simple to use. ESI proudly designs its systems in the United States. Senior-level engineers and developers at ESI headquarters in Texas create and maintain all system software.

The best-known members of the ESI product family are its all-in-one business communications systems, such as ESI C-Plus. These systems deliver advanced operating performance through seamless feature integration, and are the “smartest” phones on the market — much less in their respective price ranges. While many other manufacturers were late to discover the superior performance and reliability that digital signal processing (DSP) provides in voice storage and retrieval, ESI has been using DSP technology since 1992.

Cutting-edge technology, award-winning products and a progressive vision define the ESI difference.