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MERLIN LEGEND Communications System Release 5.0
System Manager’s Guide
555-650-118
Issue 1
June 1997
Features and Applications
Page 4-53Features
4
allows communications at double the speed of a single digital channel or
B-channel, that is, at 112 or 128 kbps.
Depending upon the equipment you are using, there are many interactions
between data workstations and system features. Not all features are available at
all data workstations. These features should be disabled at most data
workstations:
■ Voice Announce to Busy
■ Call Waiting
■ Automatic Callback
Automatic Callback can be used at data workstations that include a desktop
videoconferencing and data-sharing system (see Chapter 5, “Optimizing the
System,” for more information about this system). Privacy should be turned on at
data workstations connected to analog extension jacks, 012 modules, or 016
modules (Release 4.0 and later systems).
Remote Access 4
The Remote Access feature allows someone outside the system to call in and use
the system as if he or she were on the system. You can and should see that a
barrier code is programmed for each remote access user, who enters that code as
a password for access to the system. Your Lucent Technologies representative
can help you plan these barrier codes as needed and help you designate an
outside trunk for use by people calling in for remote access to the system.
Remote access requires that you have a certain number of touch-tone receivers
(TTRs) to interpret the digits entered by remote access users, who must use
touch-tone telephones. These TTRs are supplied on the control unit modules. The
number required depends upon the call volume you anticipate. Discuss this with
your Lucent Technologies representative.
Calling restrictions can and should be associated with each barrier code, so that
remote access users cannot make unauthorized calls. In a Hybrid/PBX system,
an Automatic Route Selection (ARS) Facility Restriction Level (FRL) can ensure
that remote access users are restricted just like other system users.
In Release 3.1 and later systems, the default FRL assignment for a barrier code is
0, restricting all outside calls.
Take these additional measures to enhance system security:
■ Change remote access barrier codes frequently. This helps prevent toll
fraud when someone has revealed his or her barrier code to others.
■ Delete unused barrier codes immediately.
■ Always use the longest possible barrier codes.