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E.
Alarm Clue Definition Tips
This section describes techniques that can be used to avoid
common problems that are often encountered when defining Alarm
Clues.
To effectively detect Toll Fraud, Alarm Clues must produce an
accurate count of calls that match the characteristics of a suspect
phone call. Careful planning will allow you to create clues that
count suspect calls, and ignore calls you don't need.
E.1.
Headers, Banners, and Other "Non-Data"
When you examine data produced by the PBX, you will often
discover that in addition to call records, the PBX also creates
records that do not contain call data. In order to avoid counting
this "non-data", clues must be carefully defined to exclude headers
and other items.
In the example below, several call records are shown along with a
header. The PBX might generate this header after every 100 calls
to identify the record fields. This is helpful when defining the
format, but can also be a nuisance when counting calls.
+-----+---+-----+---------------+-----+
TIME
EXT
DUR
NO. DIALED
COST
+-----+---+-----+---------------+-----+
|09:15|074|01:25|19495869950
|00.35|
|09:17|112|00:45|18008547226
|00.00|
|09:18|085|00:20|8531212
|00.10|
|09:20|124|02:25|19495839514
|00.55|
|09:18|091|00:25|411
|00.10|
Apx-7
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