ESI IVX 128 Digital Phone System with 612 Port Card (Refurbished)Key Features: IVX 128 (IVX stands for Integrated Voice Exchange, while 128 indicates the systems maximum number of call processing ports) is an advanced business telecommunications system that includes not only phone service but also voice mail, an automated attendant, automatic call distributor (ACD) and computer integration The system itself is housed in a surprisingly small case that is wall mounted in the telephone equipment room The system is