Brother MFC-9030 Owner's Manual page 43

Fax/Tel (F/T) Mode
When you share one line for your telephone and fax machine, in the Fax/Tel (F/T) Mode, the
machine can determine whether an incoming call is a fax or a telephone call. (See Select Receive
Mode, page 27.)
Tel Key
This key is used to enter into a telephone conversation having picked up the handset of an external
telephone in F/T pseudo-ringing.
Also, if you press Tel when you are talking lifting the external telephone's handset with the other
end, you can hear the other end from machine's monitor speaker, but the other end cannot hear you.
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Chapter 4