ESI IVX PC Local Network Card (Refurbished)Key Features: If equipped with an LNC, the IVX 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 I IVX E Class Generation II IVX 128 IVX 128 Plus IVX X Class Refurbished