Instruction manual

Lines
Barrier Codes
3-12 Line options
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 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.
Planning Form Instructioins
Record class of restriction on Form 3a. Use page 3 for class of resttriction
without barrier codes and page 4 for class restriction with barrier codes.
Note: Page 4 of Form 3a holds programming information for four barrier
codes. Duplicate the Form if More barrier codes are planned.
Page 3 of Form 3a, has two sections: "Tie Trunks" and "Non-Tie Trunks." For each
section:
1.
Check "Outward restrict" to keep the factory setting.
2.
Check either "Unrestriced" or "Toll Resttrict" to change from outward
restricted.
Under the "Allowed List Access" and "Disallowed List Access" headings:
3.
Check the boxes if you plan to assign these lists.
Note: The Allowed and Disallowed List numbers will be filled in later.
On page 4 of Form 3a, for each barrier code:
4.
Write the barrier code number in the space provided. Start with 1 and
number sequentially.
5.
Write the 4-digit barrier code in the "Digits" space. To keep the code
private, leave the space blank.
6.
Repeat Steps 1 through 3 listed under the page 3 instructions.