Canon Color imageCLASS MF8450c Basic Operation Manual page 206

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Auto RX Mode
In this mode, the machine receives documents automatically. Select this mode if you use the machine for fax
operations only, and not for voice communications using an external telephone.
Before using this mode
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Simply set the receive mode to <Auto RX>. (See "Selecting the Receive Mode, " on p. 5-9.)
When an incoming call is received
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With no external telephone connected to the machine:
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• For fax calls, the machine receives fax documents automatically.
For telephone calls, you cannot talk to the caller.
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– With external telephone connected to the machine:
If you want to change <Incoming Ring>, see "Setting the Incoming Ring Tone, " on p. 5-102.
Introduction to Using Fax Functions
5-5