AT&T MERLIN LEGEND System Reference Manual page 109

Features
Calling Restrictions
Description
See "Automatic Route Selection" in this
chapter for more on ARS.
See "Allowed Lists" and "Disallowed
Lists" in this chapter for details.
Mode Differences
Hybrid/PBX
Key and Behind Switch
2-60 Calling Restrictions
Calling restrictions help a company manage communications costs and
resources. Through calling restrictions, users at individual telephones can be
restricted from making certain types of calls:
Outward Restriction. The telephone cannot be used to make outside calls.
Incoming calls can be answered and inside calls can be made and received.
Toll Restriction. The telephone cannot be used to make toll calls. Incoming
toll calls can be answered, and local and inside calls can be made and
received.
Pool Dial-out Code Restriction (Hybrid/PBX only). The telephone cannot
be used to dial a pool dial-out code. This restricts outgoing calls from
specific pools and can be used to reserve pools for specific purposes-for
example, for data communications only.
Automatic Route Selection Facility Restriction Level (FRL) (Hybrid/PBX
only). The telephone is restricted to certain routes. When Automatic Route
Selection (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 telephones and are used to determine
whether callers have permission to use the routes. However, the FRL
assigned to a telephone is the opposite of an FRL assigned to a route. In
other words, a telephone with an FRL of 0 has the fewest ARS privileges (that
is, levels 1-6 cannot be used), and a telephone with an FRL of 6 has the most
privileges. To use a route, the telephone must have an FRL equal to or
greater than the route's FRL
If the restrictions are too limiting, an Allowed List can be used in combination
with calling restrictions. An Allowed List is a list of telephone numbers (such as
emergency numbers) that a user with an outward-or toll-restricted telephone
can dial. If no calling restrictions are assigned to a telephone or to supplement
calling restrictions, a Disallowed List can be used. A Disallowed List is a list of
telephone numbers (for example, 900 numbers) that cannot be dialed from a
telephone.
In the Hybrid/PBX mode, all calling restrictions can be assigned.
In the Key and Behind Switch modes, outward and toll restrictions can be
assigned, while the pool dial-out code restriction and ARS FRL cannot be
assigned.