AT&T MERLIN LEGEND System Reference Manual page 110

Features
Considerations
Feature Interactions
Allowed Lists
Auto Dial
Automatic Route Selection
Callback
In the Hybrid/PBX mode, an outward-restricted telephone cannot be used to
make an ARS call except to emergency numbers.
Users with Pool buttons on their telephones can use the pool even if the pool
dial-out restriction is assigned to the telephone.
Only outgoing calls are affected; users can receive inside, local, and toll calls
on restricted telephones and can join any type of call in progress.
If a tip/ring equipment user does not dial with 15 seconds after hearing an
outside dial tone, the touch-tone receiver (TTR) is removed from the call.
Once the TTR is removed, the user has approximately nine seconds before
the local telephone company disconnects the call. After the disconnection
the user can override calling restrictions and dial undetected by the system.
When a user with an outward-restricted telephone presses a dialpad button
while on a call, the call is disconnected, the user hears a fast busy, and the
line/trunk is released. When the dialpad is used, 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 telephone.
When used with Calling Restrictions, Allowed Lists can permit the dialing of
specific numbers (such as emergency numbers) from an outward- or toll-
restricted telephone.
A user with an outward-restricted telephone cannot dial an outside number by
using an Auto Dial button unless the number is on an Allowed List assigned to
the telephone. A user with a toll-restricted telephone cannot dial a toll number
by using an Auto Dial button unless the number is on an Allowed List assigned
to the telephone.
The use of ARS does not allow users to avoid calling restrictions. The system
checks for outward or toll restrictions assigned to the telephone before it selects
the best route for making the call. If the ARS Facility Restriction Level assigned
to the telephone 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 via ARS even if the telephone
is restricted from the pool dial-out code.
In the Hybrid/PBX mode, a user with a restricted telephone can use Callback for
a busy pool because restrictions are based on the specific trunk being used to
make the call. When a trunk in the busy pool is available, the system checks for
restrictions assigned to the telephone. If the telephone is restricted, the user
hears a fast busy signal to indicate that the call is not allowed.
Calling Restrictions 2-61