Telephone system

Abstract

Abstract PURPOSE:To prevent the occurrence of malfunction by providing a means storing information on a telephone set to be connected and a control means controlling a holding function by means of a holding means based on information on the telephone set connected to a line wire. CONSTITUTION:When an automatic answering telephone set 17 is set in an off-hook state in response to a call, an off-hook detection circuit 24 detects the off-hook state concerned and the off-hook detection circuit 24 supplies a detection signal to an operation control means 5. It decides an extension telephone set which is off-hooked based on the detection signal. The operation control means 5 only decides whether a DTMF signal supplied from a trunk line agrees with a release code stored in RAM 18. Since the operation control means 5 decides only the input of the release code, a holding action is prevented in the remote control signal (formed by DTMF signal) from the trunk line and the remote control of the automatic answering telephone set 17 is surely realized.

Inventors

• 👤 Yuichi Suetsugu
• 👤 末次　裕一

Bibliographic Details