PURPOSE: To scale down a device and to reduce its cost by providing a table where digital data of a variety of tone signals is stored, an identification means for identifying the type of said signals and data processing part, converting the data outputted from the data processing part into an amplitude voltage of the tone signal and generating the tone signal specified from an exchange.

CONSTITUTION: In accordance with information inputted from a code identification part 5, a processor 9 reads out digital data of outputted tone signals from a table 10, and outputs data of four bits to an output port 11 according to the data. Resistances R1, R2, R3 and R4 having different resistance values are connected to respective terminals of the output port 11, and 16 types of voltages can be outputted by synthesizing voltages arising in these resistances. A mixing circuit 12 synthesizer voltages arising in the resistances R1, R2, R3 and R4. The synthesized voltages are amplified by an amplifier 7 and outputted to a transmitter/receiver 7 through an amplified call circuit 6, and the specified tone signals is outputted from an exchange 1.