ESI CS 100 Phone System (ESI-100)

The ESI-100 Communications Server is a phone system that supports both digital and IP phones depending on what modules you have installed (please note, IP licensing required).  This listing is...

ESI IVX 56S S-Class Gen II 482 Port Card (5000-0294)

The ESI IVX S-Class Gen II 482 expansion card provides additional lines, extensions, and analog extensions to your ESI phone system. The ESI IVX S-Class Gen II 4x8x2 card provides 4 analog lines, 8...

ESI A12 Analog Station Card 5000-0425

The ESI A12 (5000-0425) is an analog station card designed to fit ESI 200, 600, and 1000 Communications Servers. The ESI A12 features twelve analog station ports which are perfect for connecting your...