Hi Deon,

If you are looking for a billing engine (which I find it more suitable
than complete billing system for hosted environments, same approach as
FreeSWITCH +/or Kazoo - it does not enforce any business rules), take a
look on CGRateS.
It is opensource, very fast (12k+ requests per second), real-time,
scalable (fire up more instances as you need them), feature-rich
(multi-tenancy, supports advanced concepts as multiple calls out of same
account, multiple balances inside one account, derived charging - eg:
reseller chaining, grouped rating - charge using various billing
increments within same call), API driven (full set of APIs available in
both JSON and GOB) and production ready (runs already at MVNOs, ISPs,
wholesale suppliers sites live).

Happy to help you more!
DanB

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