Brother FAX-3800 - Manual (Page 42)

2 - 14 A S S E M B L Y A N D C O N N E C T I O N S
Custom Features on Your Phone Line
If you have Voice Mail, Caller ID, Call Waiting, Call Waiting/Caller ID,
RingMaster, an answering service, an alarm system or other custom features on
one phone line, it may create a problem with the operation of your MFC.
(See
I have difficulty with custom features on a single line. , page 13-9.)