985F-01L
Where to Connect the Telephone Line (MF756Cx / MF469x / MF465dw / MF275dw / MF274dn)
Connect the telephone line to the telephone line jack 
.
.MF756Cx
MF469x / MF465dw
MF275dw / MF274dn
When connecting an external telephone or an optional handset,
To the jack on the machine
When connecting an external telephone or optional handset: Connect to
(handset or external telephone jack) of the machine.
When connecting an external telephone or optional handset: Connect to
(handset or external telephone jack) of the machine.MF756Cx
MF469x / MF465dw
MF275dw / MF274dn
When connecting an external telephone or an answering machine: Connect the telephone line from the telephone to the external telephone jack on the machine.
on the machine.
If you connect an external telephone with fax functionality, disable the automatic fax receive settings on the telephone.