AT&T MERLIN LEGEND Release 4.0 Feature Reference page 357

Feature Reference
Multi-Function Module
At a Glance
Users Affected
Reports Affected
Mode
Telephones
Hardware
RISK OF ELECTRICAL SHOCK: Follow all warnings and cautions.
!
WARNING:
ONLY a qualified technician should install, repair, or set options for an
MFM.
Do not touch the circuitry on the MFM. Touching the circuitry may result in
component damage from electrostatic discharge.
Before installing the MFM, disconnect all trunk and/or power cords
attached to the MLX telephone. This is to ensure that no hazardous
voltages are present during assembly. Ringing voltage from the MFM
attached to the MLX telephone can cause electrical shock if adjustments
are made while the cords are connected.
Description
The Multi-Function Module (MFM) is an optional adapter installed inside an MLX
telephone and used for connecting tip/ring or external alert devices. The MFM
operates on one of the two communications channels assigned to the
telephone; therefore, calls can be made to and from the device independently
of the telephone. The communications channel is also used for the Voice
Announce to Busy feature. Because of this, when a call is active at both the
MLX telephone and the MFM device, the Voice Announce to Busy feature
cannot be used to reach the MLX telephone user. Conversely, if the Voice
Announce to Busy feature is being used to reach the MLX telephone user, calls
cannot be made from the device connected to the MFM. In addition, if the Voice
Announce to Busy feature is being used at the same time that a call is received
at the MFM extension number, the caller hears ringing and the device rings if it
can. But the call to the MFM extension number cannot be answered until one of
the communications channels is free (the MLX telephone user hangs up or the
person calling the MLX telephone user hangs up).
Telephone users except DLC, QCC operators
SMDR
All
MLX telephones except QCC
Tip/ring interface
Multi-Function Module
357