AT&T MERLIN LEGEND Release 2.0 Installation Section page 336

Installing Applications
Hardware Requirements
MERLIN MAIL Voice Messaging System unit and power cords
remote maintenance device (with a wall-mount transformer)
modem cable with a 9-pin connector at one end and a 25-pin
connector at the other end to connect the remote maintenance device
to the serial port on the MERLIN MAIL Voice Messaging System unit
D4BU modular cords (two for a 2-port system or four for a 4-port
system, plus one for the remote maintenance device)
012 basic telephone module
NOTE:
Additional touch-tone receivers (TTRs) may be needed for
the 012 module to handle a large number of voice
connections.
MERLIN MAIL Voice Messaging System connects to two or
four 012 basic telephone module jacks on the control unit.
The MERLIN MAIL Voice Messaging System unit can be
desk- or wall-mounted and should be placed in an area with
low humidity and proper ventilation.
Follow the power and ground procedures for T/R
telephones that require auxiliary power.
Installation Procedure
See the documentation indicated below for installation procedures.
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MERLIN MAIL Voice Messaging System