AT&T MERLIN LEGEND Release 2.0 Programming Summary Manual page 254

System Features
use a computer to dial an access code and then publish the information to
other hackers. Enormous charges can be run up quickly. It is the customer's
responsibility to take the appropriate steps to properly implement the features,
evaluate and administer the various restriction levels, protect access codes,
and distribute access codes only to individuals who have been fully advised
of the sensitive nature of the access information.
Common carriers are required by law to collect their tariffed charges. While
these charges are fraudulent charges made by persons with criminal intent,
applicable tariffs state that the customer of record is responsible for payment
of all long-distance or other network charges. AT&T cannot be responsible for
such charges and will not make any allowance or give any credit for charges
that result from unauthorized access.
To minimize the risk of unauthorized access to your communications system:
Use a nonpublished Remote Access number.
Assign authorization codes randomly to users on a need-to-have basis,
keeping a log of ALL authorized users and assigning one code to one
person.
Use random sequence authorization codes, which are less likely to be
easily broken.
Deactivate all unassigned codes promptly.
Ensure that Remote Access users are aware of their responsibility to
keep the telephone number and any authorization codes secure.
When possible, restrict the off-network capability of off-premises
callers, via use of Call Restrictions and Disallowed List capabilities.
When possible, block out-of-hours calling.
Frequently monitor system call detail reports for quicker detection of
any unauthorized or abnormal calling patterns.
Limit Remote Call Forward to persons on a need-to-have basis.
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Remote Access Features