AT&T MERLIN LEGEND System Reference Manual page 112

Features
Pools
Queued Call Console
Speed Dial
System Access
Touch-Tone or Rotary
Signaling
System Programming
Specific pools can be restricted from being used for outgoing calls by assigning
a pool dial-out code restriction to telephones.
Calling restrictions can be assigned to QCCs. Since calling restrictions apply to
telephones used to initiate a call transfer to an outside number, a user with a
restricted telephone can circumvent restrictions by asking a system operator
with an unrestricted console to connect an outside call.
When a marked System Speed Dial code is used to dial a number and the
number includes a toll telephone number in addition to an access number, the
dialed number overrides any calling restrictions (such as toll or outward
restrictions) assigned to the telephone.
A user with an outward-restricted telephone cannot dial an outside number by
using Personal Speed Dial or System Speed Dial (excluding a marked System
Speed dial code) 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 Personal Speed Dial or System Speed Dial (excluding a marked System
Speed dial code) unless the number is on an Allowed list assigned to the
telephone.
Calling restrictions assigned to the telephone being used to make the call apply
to calls made by using a Shared System Access button.
If a tip/ring equipment user does not dial within 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.
Assign or remove outward or toll restriction to individual telephones.
Extensions -> Restriction
Assign or remove pool dial-out code restriction to individual telephones.
Calling Restrictions 2-63