Tel-One Group phone is based on the WS824 Group Phone System, using elegant phone designs. Tel-One Group is based on the WS824 Group Phone System, using elegant phone designs,achieve the various functions of the PBX system applications, systems composed of two parts:1) WS824 Group Phone System(2 Co lines and 8 Exts system)2) WS824 Digital key phone (full function key monitoring and operation) ...