PURPOSE: To enable automatic transfer without manual intervention automatically transmitting a restart signal to a line when an interruption inform signal is detected from the same line.

CONSTITUTION: The communication equipment provided with a telephone set control circuit 2 connected through a line control circuit 1 to an ISDN line so as to perform man-machine control is provided with an interruption inform signal detecting means 1A for detecting the interruption inform signal to be transmitted from the line when an interruption signal is transmitted to the line by the communication equipment under communication while being connected to the same line, and a restart signal sending means 1B to automatically transmit the restart signal when the interruption inform signal is detected.