Install asterisk and A2billing system, to handle up to 500 Concurrent calls on 1 server where as MySQL and Asterisk both running on the same server.
Custom compiled asterisk with no unnecessary functions and apps. and not using any transcoding at all for now. A2billing modified in order to only perform wholesale call termination functions (prepaid and postpaid). with some calling card, did, rates, etc. but the primary reason for the system is to be billing for prepaid termination
Prior experience doing this type of work is a must.
Flat rate initial setup and long term hourly support also a must. So we are looking for a person to initially setup this system and then for hourly support