Lucent Technologies MERLIN LEGEND Release 6.0 Maintenance And Troubleshooting Manual page 319

MERLIN LEGEND Communications System Release 6.0
Maintenance and Troubleshooting 555-660-140
Customer Support Information
Toll Fraud Prevention
!
SECURITY ALERT:
The MERLIN LEGEND system ships with ARS activated with all
extensions set to Facility Restriction Level 3, allowing all international
calling. To prevent toll fraud, ARS Facility Restriction Levels (FRLs)
should be established using:
FRL 0 for restriction to internal dialing only
FRL 2 for restriction to local network calling only
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)
FRL 4 for international calling
In Release 3.1 and later systems, default local 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 your system is part of a private network, assign Disallowed List 7 to
Issue 1
February 1998
Page A-15