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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Customer Support Information
Page A-12Toll Fraud Prevention
A
■ Customers should also take advantage of Lucent Technologies monitoring
services and devices, such as the NetPROTECT
SM
family of fraud-
detection services, CAS with HackerTracker
®
, and CAT Terminal with
Watchdog. Call 1 800 638-7233 to get more information on these Lucent
Technologies fraud detection services and products.
Security Risks Associated with Transferring
through Voice Messaging Systems 1
Toll fraud hackers try to dial into a voice mailbox and then execute a transfer by
dialing
*T. The hacker then dials an access code (either 9 for Automatic Route
Selection or a pooled facility code) followed by the appropriate digit string to either
direct dial or access a network operator to complete the call.
NOTE:
In Release 3.1 and later systems, all extensions are initially and by default
restricted from dial access to pools. In order for an extension to use a pool
to access an outside line/trunk, this restriction must be removed.
Preventive Measures 1
Take the following preventive measures to limit the risk of unauthorized transfers
by hackers:
■ Outward restrict all MERLIN LEGEND Communications System voice mail
port extension numbers. This denies access to facilities (lines/trunks). In
Release 3.1 and later systems, voice mail ports are by default outward
restricted.
■ As an additional security step, network dialing for all extensions, including
voice mail port extensions, should be processed through ARS using dial
access code
9.
SECURITYlALERT:
!
The MERLIN LEGEND Communications System ships with ARS
activated with all extensions set to FRL 3, allowing all international
calling. To prevent toll fraud, ARS 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