| 摘要 |
PURPOSE:To allow a connected analog telephone set to ring a call tone by devising a changeover section such that the call signal is inputted to the analog telephone set when a control signal is outputted. CONSTITUTION:Upon the receipt of a connection command from an integrated services digital network to an analog telephone set 3, a call signal control section 15 of an analog telephone set interface section 11a sends a control signal commanding production of a call tone from the analog telephone set 3 via a modular jack 14. Upon the receipt of this control signal, a changeover section 21 selects a call signal generated from a call signal generating section 20 and outputs the selected signal to the analog telephone set 3. Thus, the analog telephone set 3 generates the call tone.
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