Executone IDS 228 Key Service Unit (Refurbished)The Integrated Digital System (IDS) is a fully featured digital telephone system with a capacity of up to 648 ports. The IDS platform can be registered as a key system, Hybrid or PBX. The IDS platform is a single solution available in six different size configurations: 42 ports, 84 ports, 108 ports, 228 ports, 432 ports and 648 ports. Migration through the different port sizes is achieved by changing some of the common equipment. All IDS telephones