KEY PHONE SYSTEM FOR PREVENTION OF CRIMES AND THE PROCESSING METHOD OF THE FUNCTION

摘要

a system controller(1); a memory(2) for storing an operating program; a data communication unit(3) for transceiving between external and inner lines and a controller; a matrix unit(4) for transmitting and controlling voice and other signals between lines; a sensing unit(21) for checking a security sensor; a voice memory unit(22) for recording voices and transmitting recorded voices to local lines; a security unit(20) which has a signal detector(23) for detecting tone signals from the telephone exchange station; and a security sensor(30) connected to the key phone system.