Hello! I have 10 years of experience in VoIP with Asterisk PBX. You can check my profile where you will see I have experience with billing solutions. I've installed and configured VoIP billing app multiple times.
In my opinion, you need A2Billing. It's flexible, it's open source and works flawlessly. I can:
- Install A2Billing and Asterisk PBX to work perfectly
- Configure A2Billing for a calling card service
- Load some rates and rateplans as example, and teach you how to do it
- Add some clients and show you how to do it
Let's chat before you award the project to talk about the details.
Regards,
F.