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MERLIN LEGEND Communications System Release 6.0
System Manager’s Guide
555-660-118
Issue 1
February 1998
Customer Support Information
Page A-13Toll Fraud Prevention
A
■ FRL 3 for restriction to domestic long-distance (excluding
area code 809 for the Dominican Republic as this is part of
the North American Numbering Plan, unless 809 is required)
■ RL 4 for international calling
In Release 3.1 and later systems, default local and default toll tables
are factory-assigned an FRL of 2. This simplifies the task of
restricting extensions: the FRL for an extension merely needs to be
changed from the default of 3.
Each extension should be assigned the appropriate FRL to match its
calling requirements. All voice mail port extensions not used for
Outcalling should be assigned to FRL 0 (the default setting in
Release 3.1 and later).
■ Deny access to pooled facility codes by removing pool dial-out codes 70,
890-899, or any others on your system.
■ Create a Disallowed List or use the pre-prepared Disallowed List number 7
(Release 3.1 and later systems only) to disallow dialing 0, 11, 10, 1700,
1809, 1900, and 976 or 1(wildcard)976. In Release 3.1 and later systems,
Disallowed List number 7 does not include 800 and 1800 and 411 and
1411, but Lucent Technologies recommends that you add them. Assign all
voice mail port extensions to this Disallowed List. Lucent
Technologies recommends assigning Disallowed List number 7.
This
is an added layer of security, in case outward restriction is
inadvertently removed.
(In Release 3.1 and later systems, voice
messaging ports are assigned by default to Disallowed List number 7.)
If Outcalling is required by voice messaging system extensions:
■ Program an ARS Facility Restriction Level (FRL) of 2 on voice mail port
extension(s) used for Outcalling.
■ If 800 and 411 numbers are used, remove 1800, 800, 411, and 1411 from
Disallowed List number 7.
■ If Outcalling is allowed to long-distance numbers, build an Allowed List for
the voice mail port extension(s) used for Outcalling. This list should contain
the area code and the first three digits of the local exchange telephone
numbers to be allowed.
Additional general security for voice messaging systems:
■ Use a secure password for the General Mailboxes.
■ The default administration mailbox, 9997, must be reassigned to the
system manager’s mailbox/extension number and securely password
protected.