AT&T MERLIN LEGEND Release 4.0 Feature Reference page 110

Feature Reference
Outward Restriction for VMI ports
In Release 3.1 and later, any port programmed as a VMI port is programmed
with outward restriction on.
If the system manager wants to allow access to the voice messaging system
Outcalling feature, the outward restriction applies to Outcalling calls.
!
Security Alert:
Any changes to the 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 outward
restriction of the port is not turned off for the port. If outward restriction should
be turned off, the system manager must change it thorough system
programming.
Pool Dial-Out Code Restriction
(Hybrid/PBX Only)
A restricted extension cannot be used to dial specific pool dial-out codes. This
restricts outgoing calls from specific pools and can be used to reserve pools for
specific purposes, for example, data communications.
In Release 3.1 and later releases, the factory setting is for all extensions to be
restricted from using any pool.
Facility Restriction Level (Hybrid/PBX Only)
The Automatic Route Selection (ARS) Facility Restriction Level (FRL) is used to
restrict the extension to certain routes. When ARS is used, an FRL is assigned to
control or restrict access to specific routes in an ARS table. There are seven
FRLs assigned to routes, ranging from 0 to 6, where 0 is the least restricted and
6 is the most restricted.
FRLs from 0 to 6 are also assigned to extensions and are used to determine
whether callers have permission to use the routes. To use a route, the telephone
must have an FRL equal to or greater than the route's FRL. Therefore, the
restrictions of the FRL assigned to an extension are the opposite of the
restrictions of an FRL assigned to a route. In other words, an extension with an
FRL of 0 has the fewest ARS privileges (routes with levels 1 through 6 cannot be
used), and an extension with an FRL of 6 has the most privileges (any route may
be used). See "Automatic Route Selection" for additional ARS information.
Restrictions for VMI ports ,
In Release 3.1 and later, any port programmed as a VMI port is programmed
with a Facility Restriction Level (FRL) of 0.
110
Calling Restrictions