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Issue 2.0 December 1995 A-9
If call transfers are restricted to subscribers, a caller cannot initiate a transfer to
an off-premises destination unless the digits entered match an administered
subscriber’s mailbox identifier. To ensure the integrity of the “subscriber”
restriction, do not administer mailboxes that start with the same digit(s) as a valid
switch trunk access code.
Detecting Toll Fraud
Some of the Intuity system reports are valuable in determining if your voice
messaging or automated attendant systems are being used for fraudulent
purposes.
Call Detail Recording
With Station Message Detail Recording (SMDR) activated for incoming calls, you
can check the calls into your voice mail ports. A series of short holding times may
indicate repeated attempts to enter voice mailbox passwords.
Review SMDR reports for the following symptoms of voice messaging abuse:
■ Short holding times on calls where voice messaging is the originating
endpoint or terminating endpoint
■ Calls to international locations not normal for your business
■ Calls to suspicious destinations
■ Numerous calls to the same number
■ Undefined account codes
NOTE:
The MERLIN LEGEND system only records the last extension on the call.
Internal toll abusers transfer unauthorized calls to another extension before
they disconnect so that the SMDR does not track the originating station. If
the transfer is to your voice messaging system, it could give a false
indication that your voice messaging system is the source of the toll fraud.
Review the Call Accounting System (CAS) and HackerTracker documentation on
how to use SMDR reports.