This object uniquely identifies a row in
csiJoinWindowPeriodTable. The Management Application chooses
this value by reading csiJoinWindowPeriodNextFreeIndex while
creating an entry in this table. If an entry already exists
with this index, the creation of the entry will not continue
and error will be returned. The Management Application should
read the value of csiJoinWindowPeriodNextFreeIndex again and
retry with the new value for this object.