The following redirection problem may happen with certain kinds of fax machines on the market made by companies other than Canon. The Check Dial Tone Before Sending mode prevents this rare occurrence from happening.
If you are sending a fax document from your machine at the same time another fax machine (made by a company other than Canon) is trying to send you a fax, your fax document may end up being redirected to that fax machine, instead of the original destination you had intended.
Setting Check Dial Tone Before Sending to 'On' enables you to avoid such sending problems.
For information on the optional products required to use this function, see "Optional Products Required for Each Function."
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IMPORTANT
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If the phone line your machine is using is connected to a PBX or network adapter, you may not be able to send faxes if Check Dial Tone Before Sending mode is set to 'On'.
This mode is not available in some regions.
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1.
Press 
→ [Function Settings] → [Send] →[Fax Settings] →[Check Dial Tone Before Sending].
→ [Function Settings] → [Send] →[Fax Settings] →[Check Dial Tone Before Sending].2.
Select [On] or [Off] → press [OK].
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NOTE
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The Check Dial Tone Before Sending mode is enabled only after you restart the machine (the main power switch is turned OFF, and then back ON).
For more information on how to turn the main power ON and OFF, see "Main Power and Control Panel Power."
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