82JS-015
Where to Connect the Telephone Line
Connect the telephone line to the telephone line jack 
.
.MF746Cdw / MF745Cdw / MF743Cdw / MF656Cdw / MF644Cdw
MF543dw
MF455dw / MF452dw / MF449dw / MF448dw / MF445dw
When connecting an external telephone,
To the jack on the machine
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. MF746Cdw / MF745Cdw / MF743Cdw / MF656Cdw / MF644Cdw
MF543dw
MF455dw / MF452dw / MF449dw / MF448dw / MF445dw
If you connect an external telephone with fax functionality, disable the automatic fax receive settings on the telephone.