AT&T MERLIN LEGEND System Reference Manual page 288

Features
Privacy
Queued Call Console
Ringing/Idle Line
Preference
Ringing Options
Saved Number Dial
Signaling
Station Message Detail
Recording
System Access
Transfer
Voice Announce to Busy
The use of Privacy is not recommended for MFMs because the user does not
have an LED that indicates when the feature is active.
An MFM cannot be connected to a QCC and cannot be assigned as a QCC.
Ringing/Idle Line Preference should be enabled for an MFM.
The ringing patterns for tip/ring devices connected to an MFM are those of an
MLX telephone rather than a single-line telephone—one ring for inside calls, two
rings for outside calls and three rings for priority ring or transfer return.
Personalized ringing pattems cannot be programmed for an MFM. Centralized
telephone programming must be used to program ringing options (Immediate
Ring, Delayed Ring, or No Ring).
Saved Number Dial cannot be used on an MFM.
When set for SAA operation, an MFM can receive a manual signal but cannot
send one. An MFM cannot receive a manual signal when set for tip/ring
operation.
An MFM is treated as an MLX telephone on SMDR reports. The system waits
until the end of dialing before sending a connect message to the MFM and any
digits dialed after the connect message is received are not recorded on SMDR
reports.
It is recommended that one System Access or Intercom Ring button and one
System Access or Intercom Originate Only button be assigned to the MFM. At
least one System Access or Intercom button must be assigned to the MFM.
In the Hybrid/PBX mode, assigning a Shared System Access button for one or
more of a principal station's System Access buttons creates a situation where
the principal station can pick up calls that have already been answered by the
answering machine. There is no way to inhibit coverage with this arrangement.
Calls cannot be transferred on an MFM since the system ignores the switchhook
flash.
The Voice Announce to Busy feature is disabled when both the MLX telephone
and the device connected to its associated MFM are in use. An MFM cannot
make and answer calls when Voice Announce to Busy is being used to reach
the MLX telephone user. The calls ring at the MFM but cannot be answered until
the B channel is freed (either the MLX telephone user or the person calling the
MLX telephone user hangs up).
Multi-Function Module 2-239