A2Billing Voucher Top up

We are using the A2Billing application and are facing a problem while using. The scenario is explained below: # The min_credit_2call is set up with value of 0.05 (5 cents) # jump_voucher_if_min_credit = YES When the caller makes a call who has balance of 10 cents to a location that is charged at 15 cents per minute, the user is answered as "You do not have enough prepaid credit" and again it asks for Enter the destination. Due to this issue, we could not get the caller to refill if the balance is lesser than the destination that he is trying to call.