WTI PollCat NetLink, User Manual

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However, when the clue is defined this way, headers and
summaries with alphabetic characters in the "A" field will also
appear in the count. To prevent the clue from counting "non-data",
the "A" variable can be defined as a range as shown below:
A>17:00*A<99:99
This definition would prevent the clue from including "non-data"
records that have alphabetic characters in the "A" field, since
alphabetic characters would have a value higher than 99:99.
E.1.1.2. Exclude Non-Data Characteristics
Another way to eliminate non-data from the count is to define the
clue in a manner that excludes the characteristics of headers and
call accounting summaries.
If you examine the data generated by the PBX, there is usually a
factor which differentiates non-data from call records. In some
cases, call records will always begin with a specific character, and
non-data will omit this character. In other cases, non-data will
have a specific text item in a field, where call records will have a
numerical value. Once you have determined a factor that
differentiates between non-data and call records, it is relatively
simple to define clues that exclude the non-data.
Example: Define a clue that counts calls lasting three minutes or
longer. Assume the variable "B" represents the call duration. The
most direct way to define this clue is as follows:
B>=03:00
However, when the clue is defined this way, headers and
summaries with alphabetic characters in the "B" field would also
appear in the count.
In order to exclude undesired records, assume you have
determined that call records always begin with the character "|"
(vertical bar). In order to use this knowledge in the clue
definition, you would first re-define the format to include the
variable "L" to represent the first character in the record, and then
re-define match parameters as follows:
B>=03:00*L=|
This definition would exclude headers and summaries by only
counting records that begin with the "|" (vertical bar) character.
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Appendices