Open source or commercial pre-paid billing module to addon to freepbx

Can anyone suggest a open source or commercial billing module for freepbx. Or with a existing freepbx system up and runnning, has anyone installed a2billing on top of it to support billing ?

Please advise, thanks

the only one i can think of is a2billing

Or how about Star2billing.

The problem with ABilling is it’s overkill. AAAND, you are forced to set up your extensions in A2Billing, not in FreePBX.

You’re not forced to set up extensions in A2Billing. And yes it is overkill if you’re not selling phone cards but you can easily ignore the stuff you don’t need to use.