ESI Systems



There are five ESI Communications Server models — the ESI-1000, the ESI-600, the ESI-200, the ESI-100, and the ESI-50 — which share a vast array of features and user benefits. They vary chiefly according to their call-handling, message storage, and other capacities.

The capacities described below are maximums, which will depend on the specific ESI Communications Server model and extension dialing plan (four-digit or three-digit) which your Certified ESI Installer helps you select.



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 384 analog extensions can be programmed, based on the number of cards installed in the system. The ports can be defined as: