AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 138

Features
Allowed Lists
CAUTION
DID numbers that correspond to pool dial-out codes (or facility access
codes) can be used to avoid toll restriction, leading to toll abuse and/or
fraud. (See "Customer Support Information" in the front of this book for more
information on security.)
You can change the setting so that calls are redirected to
another extension number
the QCC queue
a calling group
Planning Form Instructions
Under the "Calls to Unassigned Extension" headin on Form 6f, do one of
the following:
Check "Primary Operator" to keep the factory setting.
To change from the factory-set redirect to the primary operator:
Check "QCC" to redirect calls to a QCC operator. Write the extension
number in the space provided. (Refer to Form 2a.)
Check "Another extension" to redirect calls to another telephone. Write
the extension number in the space provided. (Refer to Form 2a.)
Check "Calling Group" to redirect calls to a calling group. Write the
calling group extension number in the space provided. (Refer to
Form 6e.)
Use these instructions only if call restrictions are assigned to any
telephones.
An Allowed List is a list of telephone numbers that a restricted telephone can
dial. For example, if a telephone is restricted from making toll calls, an Allowed
List permits the user to call specific area codes and/or exchanges. Or, if a
telephone is restricted from making any outgoing calls, you can design an
Allowed List that permits calls to specific local or toll numbers, such as 911.
You can design up to eight lists, each with a maximum of 10 numbers. Each
number can have up to six digits—for example, an area code followed by an
exchange. You can include a leading 1, which the system doesn't count as one
of the six digits, if a toll prefix is required. Once you have designed the lists,
decide which restricted telephones have access to the list. Each restricted
telephone can have access to one to eight lists.
If FX (foreign exchange) or tie trunks are connected to the system, you can allow
people with restricted telephones to dial numbers to the area code for the FX or
tie trunk if you enter the exchange in the Allowed List. For example, if you have
an Albuquerque FX trunk (to the 345 exchange in the 505 area code), record
"345' as the Allowed List entry, not '505345.'
System Features 4-33