AT&T MERLIN LEGEND System Reference Manual page 72

Features
Conference
Directory
Disallowed Lists
Forward and Follow Me
Personal Lines
Remote Access
A user with an outward-restricted telephone cannot add an outside participant
to a conference call unless the participant's number is on an Allowed list
assigned to the telephone. A user with a toll-restricted telephone cannot dial a
toll number to add a participant unless the participant's number is on an Allowed
List assigned to the telephone.
However, if a conference-call originator with an outside call presses the
Conference button, selects an outside line, and presses Conference again
before dialing a number, the outside person can dial a toll call, thereby
overriding calling restrictions assigned to the conference originator's telephone.
The toll call is billed to the originator's company.
When a marked System Directory listing includes a toll telephone number in
addition to an access code, using the System Directory to dial the 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 a Personal Directory or System Directory listing (excluding a marked
System Directory listing) 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 a Personal Directory or System Directory listing (excluding a marked
System Speed dial code) unless the number is on an Allowed List assigned to
the telephone.
Disallowed Lists take precedence over Allowed Lists. If a telephone number is
on both an Allowed List and a Disallowed List and both are assigned to an
individual telephone, the user cannot dial the number.
A user with an outward restricted telephone cannot forward calls to an outside
number unless the number is on an Allowed List assigned to the telephone. A
user with a toll-restricted telephone cannot dial a toll number unless the number
is on an Allowed List assigned to the telephone. When activating Forward, the
user with a restricted telephone does not hear an error tone, but when a call is
received, the forward is denied if the number is not on the Allowed List.
A user with an outward-restricted telephone cannot dial an outside number on a
Personal Line 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 on a
Personal Line button unless the number is on an Allowed List assigned to the
telephone.
An Allowed List is one of the class-of-restriction (COR) items for Remote Access.
When barrier codes are not used, Allowed Lists are assigned to lines/trunks
system wide. When barrier codes are used, Allowed Lists are assigned to
individual barrier codes.
Allowed Lists 2-23