Connecting The Mfc; Connecting An External Telephone - Brother MFC-8420 User Manual

Connecting the MFC

Connecting an external telephone

Although your MFC does not have a handset, you can connect a
separate telephone (or telephone answering device) directly to your
MFC as shown in the diagram below.
(Example for Australia)
Whenever this phone (or TAD) is in use, the LCD shows
Telephone .
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Extension
Telephone
External
Telephone