Abstract: A telephone communication system (10) utilizes a computer controlled PABX (12) which connects telephone trunk lines (13) to a voice response computer (50). The PABX (12) includes an automatic call distribution unit (12a) which provides selected call control and monitoring features. The ACD unit (12a), however, works only into digital control telephone lines while the voice response computer (50) works only with conventional two-wire telephone lines. Incoming telephone calls are transmitted through the trunk lines (13) to the automatic call distribution unit (12a). These calls are routed through a digital control telephone line (18) to a telephone set (24). A register (34) together with a make busy circuit (38) operate the telephone set (24) when one of the telephone lines (40) is available.