8. The Data Filters
The Data Filters allow you to make the most efﬁcient use of NetLink II
memory by excluding records (such as inbound calls) that are not needed
for your call accounting application. When the Data Filters are correctly
conﬁgured, NetLink II will monitor each record received from the PBX.
Records that do not meet the user-deﬁned criteria will not be stored.
The conﬁguration procedure consists of three tasks:
• Deﬁne the Data Filter Format
• Deﬁne the Data Filter Parameters
• Enable the Data Filter
NetLink II features two separate Data Filters. Each ﬁlter has its own
format, variables, and storage criteria. When two dissimilar PBX units are
connected to the NetLink II, this provides a separate Data Filter for
• When NetLink II is connected to two different types of PBX
units, it is recommended to deﬁne a separate Data Filter for
• A Data Filter that is deﬁned for one type of PBX may not
function correctly if applied to another type of PBX.
• Note that the Data Filter and Alarm Filter are two separate
features, and are conﬁgured independently of one another. The
function of the Data Filter is to screen out irrelevant data, and
the function of the Alarm Filter is to provide notiﬁcation when
speciﬁc types of data are detected.
Each Data Filter Consists of a "Format" and one or more "Clues". The
Format assigns variables to individual call record locations; Clues deﬁne
the parameters that will be used as the criteria for rejection or storage of
each call record.