[Freeswitch-users] nibblebilll low balance

I have this config in nibblebill.conf.xml ----- <!-- By default, warn a caller when their balance is at $5.00. You can set this to a negative number. --> <param name="lowbal_amt" value="1"/> <param name="lowbal_action" value="lowbalance XML default"/> ---- But no effect if the cash field starts to be under 1 I'm wondering if the cash field has to be exactly 1 if not it fails ? THanks