AT&T MERLIN LEGEND Release 4.0 Feature Reference page 111

Feature Reference
If the system manager wants to allow access to the voice messaging system
Outcalling feature, the FRL applies to Outcalling calls.
!
Security Alert:
Any changes to the FRL and other restrictions of these ports must be
considered carefully in order to minimize the potential for toll fraud.
If the system manager changes a VMI port to an non-VMI port, the FRL is not
reassigned on the port. If the default FRL should be changed, the system
manager must change it thorough system programming.
Remote Access
Outward/toll and FRL calling restrictions can also be applied to remote access
users. These calling restrictions can be applied to each individual barrier code
(up to 16), or, if barrier codes are not used, to all remote access tie/DID trunks
and all remote access non-tie/non-DID trunks. See "Remote Access" for
additional information.
Night Service
Other calling restrictions can be applied when Night Service is activated. Night
Service can be set up to require a password to be dialed before a
non-emergency number. When the correct password is entered, the system
then checks for calling restrictions assigned to each extension before allowing
calls to outside numbers.
A Night Service Exclusion List can be created to exempt specific extensions
from the password requirement. However, normal calling restrictions (if any)
assigned to the extension are still in effect. A Night Service Emergency Allowed
List can also be created, which can contain up to 10 numbers that can be
dialed without entering the Night Service password. See "Night Service" for
additional information.
Considerations and Constraints
In Hybrid/PBX mode, an outward-restricted extension cannot be used to make
an ARS call except to emergency numbers. See "Allowed List/Disallowed List"
for additional information.
Only outgoing calls are affected; users can receive inside, local, and toll calls
on restricted extensions and can join any type of call in progress.
When a user with an outward-restricted extension presses the dialpad while on
a call, the call is disconnected, the user hears a fast busy signal, and the trunk
is released. The system assumes that the user is trying to make an outside call,
which is not allowed because of the outward restriction assigned to the
extension.
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Calling Restrictions