Intelligent Recording Xtension Recorder Universal Adapter 3.0 Installation And User Manual page 28

The Recorder software reads the data for Caller-ID from the information
provided your line carrier. For analog phone lines leave this setting at "Best"
(the other options are for different interface devices)
Dealing with Headsets or 'Hot Mics'
Check this option if you find the recorder is either not stopping recording
consistently, or triggers with background office noise while not on the
telephone.
Sensitivity Adjustments
In the vast majority of cases no adjustments are needed here. With some
lines a start/stop trigger for recording is based on a signal level, to make
these triggers more sensitive lower the values above, less sensitive raise
them.
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