We have set up a free VOIP service in the Netherlands based on Trixbox (Asterisk + FreePBX) on a CentOS Linux installation.
Our customers would like to be able to make calls to destinations for which we have to charge. We have chosen to do this using a prepaid system whereby users can use their normal login to make calls. We have tried A2billing but have not been able to figure it out. Can you help?
Customers will have to pay using paypal and credit must be instantly available on the users account after purchasing.