AT&T 944 - Manual (Page 34)

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ADDING A FAX MACHINE
NOTE: Do not connect a fax machine to Line 1. Doing so will interrupt
the telephone intercom data channel.
You may wish to use a fax machine with your phone. Choose Line 2, 3
or 4 for the fax machine, and connect it according to the manufacturer’s
instructions for installation and use.
• That line’s telephone number is your fax number.
• The same line can be used for outgoing calls (incoming faxes will get
a busy signal).
• Set your fax machine to answer on the first ring (follow manufacturer’s
instructions).
• To prevent the fax line from ringing at all the extensions, turn the
ringer off for that line (see "Turn Ringer On or Off" in FEATURE
SET UP).
NOTE: If you are using a fax switch, or a fax machine with a built-in
fax switch, see "Using a Fax Switch."
Using a Fax Switch
A fax switch lets the telephone know, before the phone rings, whether an
incoming call is a voice call or a fax call. Some fax machines have a built-in
fax switch. Using a fax switch may affect the operation of Line-in-use lights.