| 摘要 |
PURPOSE: A telephone device having a selective receiving function is provided to drive an ARS by previously detecting a receiving ring signal when a call is made from the outside, and to detect a signal of a number pressed by a caller to wirelessly transmit the signal to a selected telephone, so as to minimize an invasion of a person's privacy. CONSTITUTION: If a call is made from the outside, a ring detector(30) detects a ring signal of an office line(2). If the ring signal is received, an ARS block(20) performs a voice announcement. A DTMF(Dual Tone Multi Frequency) detector(40) detects a dual tone signal applied through the office line(2). A controller(90) receives a detection response of the DTMF detector(40) to analyze a called number, and generates an incoming signal delivering enable signal, to make an extension telephone only respond to the number. A wireless incoming signal delivery block(80) responds to the incoming signal delivering enable signal and delivers a wireless incoming signal. A receiving telephone selector(70) selects one of extension telephones under the control of the controller(90). A representative telephone selector(60) responds to a time over signal of a timer(50), and selects a representative telephone(10). A tone generator(5) generates an incoming sound to the representative telephone(10).
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