AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 68

Trunks
Class of Restriction
See Chapter 4 for information on
Allowed and Disallowed Lists.
Barrier Codes
Planning Form Instructions - Continued
For all trunks to which you are assigning Remote Access:
5 . Transfer the information from PBX System Form 2c, System Numbering -
Trunk Jacks to Form 3a.
Write the logical ID and trunk number in the applicable column.
Check either the "DID or Tie Trunk" or "Non-Tie Trunk" column.
Complete the "Trunk Type and Description" column.
the different bands (calling areas) or WATS trunks and different
destinations for FX trunks.
6 . Check the "Shared" column (to indicate shared access) or the
"Dedicated" column (to indicate dedicated access) for the trunks.
The class of restriction is assigned to all trunks with Remote Access. If barrier
codes are planned, you must also assign the class of restriction for each code.
Make the following decisions regarding class of restriction:
Restriction. The setting determines whether users can make local and/or toll
calls (the factory setting is for inside calls only). You can change the setting
to unrestricted (the user can make local and toll outside calls) or restricted
(the user can make only local outside calls).
Automatic Route Selection (ARS) Restriction Level. If the system has
ARS, you can restrict the use of outgoing trunks by selected users by
assigning a restriction level that is less than the Facility Restriction Level
assigned to the route.
Allowed List Asslgnment When users are restricted from making local
and/or toll calls, you can assign up to eight Allowed Lists that allow restricted
users to call specific numbers (local or toll).
Disallowed List Assignment When users are not restricted from making
calls, you can assign a Disallowed List that prevents them from dialing
specific numbers on the list.
To help safeguard against unauthorized system access, the system can be
programmed to require that remote users enter a barrier code before gaining
access to the system. AT&T strongly recommends the use of barrier codes.
CAUTION
Under applicable tariffs, the customer is responsible for any charges
incurred through the remote use of system facilities. Precautions should be
taken to prevent unauthorized use of the system's outside lines by remote
callers, also called toll fraud. See 'Customer Support Information" at the
front of this book for more information on security.
Barrier codes can be used for either DID and tie trunks or non-tie trunks. A
maximum of 16 barrier codes is allowed, each with a different class of
restriction. The class of restriction allows or denies the use of system features to
individuals or groups of users.
Include
Trunk Options 3-13