PURPOSE: To transmit absence information to a caller in voice by providing a number storage memory for registering absence information corresponding to each subscriber and also providing a device transmitting voice message information (e.g., voice synthesizer) corresponding to the number for the said absence information registration.

CONSTITUTION: When the subscriber A is absent, the subscriber A is connected to an outgoing register ORT via switch SW and a subscriber circuit LC through conventional call connection and dials an absence information special number at first. The dialed special number is discriminated as the special number for registering absence information by a central processing unit CPU and the said central processing unit CPU registers the information number (e.g., 1 digit) dialed succeedingly to a number storage memory IM for registering absence information corresponding to each subscriber. When an incoming call exists from the subscriber B to the subscriber A, the central processing unit CPU reads the information of memory area corresponding to the subscriber A from the number storage memory IM and the subscriber B is connected to the said voice synthesizer VS.