AT&T MERLIN LEGEND Release 3.1 Maintenance And Troubleshooting Manual page 270

Customer Support Information
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Keep the Remote Maintenance Device turned off when not in use
by AT&T or your authorized dealer.
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Limit transfers to registered subscribers only.
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Use the Security Violations Notification options (Mailbox Lock or
Warning Message) to alert you of any mailbox break-in attempts.
Investigate all incidents.
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Review security policies and procedures and keep them up to
date.
Choosing Passwords
Passwords should be the maximum length allowed by the system.
Passwords should be hard to guess and should not contain:
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All the same numbers (for example, 1111, 666666)
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Sequential characters (for example 123456)
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Numbers that can be associated with you or your business, such
as your name, birthday, business name, business address,
telephone number, or social security number.
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Words and commonly used names.
Passwords should be changed regularly, at least on a quarterly basis.
Recycling old passwords is not recommended. Never program passwords
(or authorization codes or barrier codes) onto a speed dial button.
Physical Security
You should always limit access to the system console (or attendant
console) and supporting documentation. The following are some
recommendations:
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Maintenance and Troubleshooting