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9-15
The Alarm Filters (Toll Fraud Detection)
9.8. Assigning the Alarm Filter to a Port
After defining the Alarm Filter, the next step is to assign the filter to one or
both PBX input ports. The Port Configuration menus are used to assign one
of the available Alarm Filters to each port as described in Section 5.4. Note
that Alarm Filters will not function until they are assigned to a port.
9.9. Match Parameter Definition Examples
The following examples are based on fictional PBX call record formats.
When designing your Alarm Filter, be aware that the record structure will
differ from those shown in the examples. When defining the Alarm Filter
Format and Match Parameters the following factors must be considered:
Exact Match: Alphanumeric values in parameter definitions must
exactly match those found in the call record. If the record shows the
time as "09:00", then the match parameters must also list the time as
"09:00", and not "0900" or "9:00".
Number of Characters: For any given variable, the number of
characters specified in the Alarm Filter Format must exactly match
the number of characters indicated in the Match Parameters definition.
For example, if the filter format defines the variable "B" as the first
seven characters of the number dialed, then the parameter definition
must account for all seven characters.
Searching for Operator Characters: When searching for a text
string which contains a space or any character that is also one of
NetLink II's operators (e.g. >, <, or &) a backslash (\) must precede
the space or operator. For example, to search for "***Error***",
the match parameter would be defined as "\*\*\*Error\*\*\*".
Likewise, when searching for "hello there", the match parameter
would be defined as "hello\ there".
Variable Case: When defining and using variables, take care to use
the correct case. Real Time variables are always entered as lowercase
characters; regular variables are always entered as uppercase
characters.
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