Canon 3300B002 On-Screen Manual page 615

Preventing Mistransmission of Faxes Page 615 of 853 pages
Transmission may take longer when this function is enabled.
Transmission will be canceled if the machine fails to receive the recipient's fax
information or if the received information does not match the fax number.
This function is not available when you send a fax manually. For details, see Sending a
.
Fax after Speaking on Telephone
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