AT&T MERLIN LEGEND MLX- 10D Operator's Manual page 16

Understanding Your Equipment
You can use a DLC with a headset, speakerphone, modem (a
device for sending computer data over phone lines), fax
machine, or answering machine. To use a modem, fax
machine, or answering machine, your console must have
special equipment. See your system manager for more
information.
Illustrations of the DLCS and headset follow. A list of terms that
describe each piece of equipment follows each illustration. A
separate illustration and description of the DSS is included.
Procedures for using the DLCS (with or without headsets) are
in Chapter 2, "Handling Calls," and Chapter 4,
Features."
Identifying Your Equipment 1-3
"Using