AUTOMATIC DIAL RETRANSMITTING SYSTEM OF BUTTON TELEPHONE

摘要

PURPOSE:To utilize effectively a trunk line by retransmitting automatically a dial at a prescribed time interval and informing the incoming call by means of a speaker receiving. CONSTITUTION:A telephone number dialed by a caller is stored in a microcomputer 1. The microcomputer 1 starts a timer circuit 3 and a re-dial circuit 4 is started so that the telephone number stored in the microcomputer 1 is redialed by a command from a timer circuit 3 after a prescribed time. When an incoming call exists, the call is detected by the re-dial circuit 4 and the microcomputer 1 starts a speaker receiving circuit 6. The user confirms the incoming call to a called party in the state of speaker receiving and enters calling by taking up a handset.