AT&T MERLIN LEGEND Release 4.0 Feature Reference page 112

Feature Reference
Users with Pool buttons on their telephones can use the pool even if the pool
dial-out restriction is assigned to the extension.
Outward and toll restriction do not work with tie trunks or with T1 lines emulating
tie trunks which are set to tie-PBX. Automatic Route Selection or pool dial-out
codes should be used to restrict these types of line/trunks.
Since calling restrictions apply to extensions used to initiate a call transfer to an
outside number, a user with a restricted extension can circumvent restrictions
by asking an operator with an unrestricted console to connect an outside call.
When a marked System Speed Dial code is used to dial a number, the System
Speed Dial number overrides calling restrictions (such as outward or toll
restrictions).
If Centrex service is used, any calling restrictions for the extension must be
administered by the telephone company at the central office.
Mode Differences
Hybrid/PBX Mode
In Hybrid/PBX mode, all calling restrictions can be assigned.
Key and Behind Switch Modes
In Key and Behind Switch modes, outward and toll restrictions can be assigned,
while pool dial-out code restrictions and ARS FRL cannot be assigned.
Feature Interactions
Allowed Lists
Auto Dial
Automatic Route
Selection
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Calling Restrictions
When used with calling restrictions, Allowed Lists can permit the dialing
of specific numbers (such as emergency numbers) from an outward- or
toll-restricted extension.
A user with a restricted extension cannot dial a restricted number
(outward or toll) by using an Auto Dial button unless the number is on
the Allowed List for that extension.
ARS does not allow users to avoid calling restrictions. The system
checks for outward or toll restrictions assigned to the extension before it
selects the best route for making the call. If the ARS FRL assigned to
the extension restricts use of the route, the user hears an error tone and
the call does not go through. Since FRL assignment determines pools
selected in each route, a user may be allowed to select a pool using
ARS even if the extension is restricted from the pool dial-out code.