Example 1: Repeated Attempts to Access
Voice Mail
This Alarm Clue counts short calls to voice mail. This type of call
could indicate that a caller is dialing into voice mail and randomly
trying access codes in an attempt to find an outside line.
For this example, assume the Alarm Filter Format is defined as
shown below. Note that the first three lines in Figure 8.7 are
sample call records, and the fourth line is the Alarm Filter Format.
The variables A, B, and D are not used for this clue.
Where:
CCCCC
is the first five characters of the user name.
EEEEE
is the field that lists the call duration.
Match Parameters for this Alarm Clue would be defined as
follows:
C=VMAIL*E<=00:30
Where:
C=VMAIL
Tells NetLink to count calls with the text
"VMAIL" in the user name field.
*
is the logical "AND" operator.
E<=00:30
Tells NetLink to count calls which last 30
seconds or less.
8-19
The Alarm Filters (Toll Fraud Detection)
|08:18|001|VMAIL
|IN |
|00:20|00.00|
|08:20|092|J.SMITH
|OUT|18008547226
|01:07|01.30|
|08:21|001|VMAIL
|IN |
|00:15|00.00|
-AAAAA-BBB-CCCCC------------DDDDDDD-----------EEEEE-------
Figure 8.7: Alarm Filter Format; Match Parameters Example 1
Содержание PollCat NetLink
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