asterisk users - Nov 2008 - What is the best way to resale termination/origination?

Hi,
We have been selling * systems for a while and always have used other
companies for origination and termination and let the client pay directly.
Since we do not have enough traffic to justify building our own
infrastructure we would like to start reselling someone else's service.
Any ideas? It would have to include easy way for billing. 
Thank you.
robert
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