Comdial Interchange WBERD-DI4 v12.0 4 Port Digital Integration Windows 2000 Pro Rack Mount PC (Licensed for 4 Ports, 4 Ports, 32 UM Clients, 32 VCM Clients, Unlimited ECS Boxes, System Reports, Remote DBA, 1 Impact Attendant, 25 Impact Integrator Clients, and 25 Impact Call Clients) Voice Mail