Canon MF247dw User Manual page 121

If the machine does not automatically set the type of telephone line
Follow the procedure below to set the type of telephone line. If you are not sure of the type of phone line you
are using, contact your local telephone company.
<Menu>
line
LINKS
Installation(P. 3)
Sending Faxes(P. 114)
Receiving Faxes(P. 142)
<Fax Settings> <Basic Settings>
Faxing
<Select Line Type>
113
Select the type of telephone