ESI IVX E2 Local Network Card (Refurbished)Key Features: If equipped with an LNC, the ESI system supports up to 12 ESI IP Feature Phones Each IP Feature Phone looks and works like a 48 Key Digital Feature Phone, but connects to the cabinet from within the local premises via an IP network (LAN) rather than twisted pair cabling Compatible with: IVX E Class Generation II IVX X Class CS 100 CS 200 (Additional adapter required) CS 600 (Additional adapter required) CS 1000 (Additional adapter