Importance

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Abstract

A facsimile apparatus selectively connecting an office line together with an external telephone set having a ring tone generator and is constituted by an internal telephone set and a facsimile main body, includes an extension channel, an office line channel, a call key, a call signal generator, first to third switches, and a controller. The extension channel connects the external and internal telephone sets to each other. The office line channel connects the external and internal telephone sets to the office line. The call key is used to call the external telephone set. The call signal generator outputs a call signal to the ring tone generator. The first switch switches the office line to one of the facsimile main body and the office line channel. The second switch normally connects the internal telephone set to the office line channel. The third switch normally connects the external telephone set to the extension channel and switches the external telephone set to the office line channel in accordance with an office line outgoing call request and an office incoming call of the external telephone set. The controller controls the second switch to switch the internal telephone set from the office line channel side to the extension channel side in accordance with depression of the call key and an off-hook operation of internal telephone set, and controls the call signal generator to output a call signal to the ring tone generator in accordance with depression of the call key and the off-hook operation. A channel is formed between the external and internal telephone sets by setting the external telephone set in an off-hook state in response to the call signal.

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First Claim