A communication device enables a voice communication with another
communication device connected to a communication circuit network. The
communication device has a calling signal detection system that detects
whether a calling signal is received from the other communication device
via the communication circuit network, a circuit closing system that is
configured to close a circuit connecting the communication device and the
other communication device when a communication starting operation is
performed by a user after the calling signal detection system detects the
calling signal from the other communication device, a state detection
system that detects whether the calling signal currently received is in
ON or OFF state, and a standby control system that controls the circuit
closing system to await closing the circuit until the state detection
system detects the OFF state of the calling signal if the state detection
system detects the ON state of the currently received calling signal.