HP 3200m - Manual (Page 153)

EN Resolving fax problems
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HP LaserJet product shared with another device:
Telephone answering machine (TAM)
An answering machine should be connected directly to the port
located on the back of the product that is labeled with the telephone
icon or should be shared on the same phone line extension.
l Set the product’s Rings to Answer for one ring more than the
Telephone Answering Machine is set. See the software Help for
more information.
l If the product is connected to same phone line, but at a different
extension, pick up the extension phone, wait 10 seconds, and
then hang-up the extension phone. The product will respond to a
fax tone and start to receive incoming faxes.
l Another option is to pickup the telephone, and press 1 - 2 - 3 in
sequence, and wait three seconds.