ESI 50 Communications Server Phone System (ESI-50) Card Slot 1:E2 482 8620 can work with the

8620 can work with the Inter-Tel Axxess phone systems and the Inter-Tel / Mitel CS-5000 series of phone systems

The 3Com 3CR17572-91 SuperStack 3 PoE Switch is stackable and rack mountable

The 1204288L2 is a redundant controller card that can fit in either slot 1 or 2 of the multiplexer

The newer ShoreTel conference is the ShoreTel 655 IP phone

ESI 50 Communications Server Phone System (ESI-50) Card Slot 1:E2 482 8620 can work with theESI 50 Communications Server Description: The ESI 50 Communications Server is a phone system that supports both digital and IP phones. Includes: (1) ESI 50 Cabinet with NSP motherboard Power Supply OPTIONAL: Port Cards and Modules