AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 19

Release 4.0 Enhancements
Downloadable Firmware for 016 T/R board and the NI-BRI board.
The PCMCIA technology introduced in Release 3.0 continues to support
these two new boards in Release 4.0 for installation and upgrade. A
Release 3.0 or later processor is required for PCMCIA technology.
Single-Line Telephone Enhancements
Disable Transfer. Through centralized telephone programming, the
system manager can disable the ability to transfer calls by removing
all but one SA or ICOM button from the telephone.
No Transfer Return. When a handset bounce in its cradle, the
MERLIN LEGEND system interprets that as a switchhook flash and
attempts to transfer a call. When the transfer attempt period expires,
the user's telephone rings. Release 4.0 eliminates this unintended
ringing by disconnecting the call in situations where a switchhook
flash is followed by an on-hook state when dial tone is present.
Forward Disconnect. All ports on 012 and 016 modules now send
forward disconnect to all devices connected to them when forward
disconnect is received from the CO. This enhancement prevents the
trunk/line form being kept active when one end disconnects from the
call. If an answering machine is connected to the port, it will not
record silence, or busy tones, or other useless messages. This is a
non-administrable operation.
7-digit password for SPM
Release 4.0 has increased system security by requiring a 7-digit
password when using SPM to perform remote administration or when
performing the Trunk Test procedure. This password is to be used in
addition to the Remote Access barrier codes.
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System Planning