Instruction manual

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:
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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 per person.
Use random sequence authorization codes, which are less likely to be broken.
Deactivate all unassigned codes promptly.
Ensure that Remote Access users are aware of their responsibility to keep the telephone
numbers 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-know” basis.
DANGER
The AT&T System 25 cabinets are not user serviceable.
Some voltages inside the cabinets are hazardous. This
equipment is to be serviced only by qualified technicians.