Brother MFC7150C - Manual (Page 39)

24
C H A P T E R T W O
Whenever this phone (or TAD) is in use, the screen displays EXT. TEL IN
USE, and, if the fax handset is lifted, an alarm sounds. To disconnect the
call on the external phone and switch to the fax, press
Hook or Speaker Phone .
The external telephone cannot be used while a function is being performed
on the control panel.