Hello,
You have to install asterisk and a2billing and build a setup that would support 1000 concurrent calls. I think, this would need 4 asterisks in a cluster. Remember that you have to support all the features like pbx, Callback, Call Forwarding, hunting, conference, etc. Needs to be integrated with paypal and [[login to view URL]][1]. Database would be MySQL. Can you support Oracle ?
A2Billing theme needs to be customized.
Please let me know, if you can do this and also the timeframe.
Thanks
## Deliverables
All the features of asterisk need to be supported.
Happy Bidding