csubSessionFallingThresh
1.3.6.1.4.1.9.9.786.1.2.3.1.2
This threshold, if non-zero, indicates the falling threshold
for the value of csubAggStatsUpSessions for the aggregation
point,
When the current sample of csubAggStatsUpSessions is less than
or equal to this threshold, and the value of
csubAggStatsUpSessions
for the last sample interval was greater than this thershold,
the
csubSessionFallingNotif is triggered.
If the value of this threshold is 0, the threshold is
not evaluated.