Balance not deduct from international credit for prepaid and postpaid customer

Steps:

1. Install international credit add on
2. Now set International prefix as 91 or 1 for PSTN call from Configurations > Settings >
InternationalPrefixes
3. Now set OR and TR for 91 or 1 as above setted Code
4. Now go to Accounts > International Credits
5. Now recharge for customer which are using for PSTN call
6. Now register customer in zoiper and Make a call and check balances after Hangup call

Expected result : For Prepaid and postpaid customers balance should be deduct from international credit not from main balance.

Actual result : For Prepaid and postpaid customers balance not deduct from international credit balance But it's deduct from main balance.

Note : Above issue is face in Prepaid and Postpaid Both Customers. So Kindly note.