A2billing

Hi, I need a a2billing specialist who can install on two servers and Configure. My requirements are that two of the servers be redundant act as in one server because of the number of calls i need to process. I imagine asterisk gets weird after 120 concurrent calls by reading on the posts. Moreover, i have two boxes and thus i would need some consulting as well as to what is the best way to go around this to accomplish what i'm attempting to do. It is going to be a prepaid and postpaid service with ANI authentication therefore i'm going to need my merchant account set up as well with the boxes so it can process. In other words a ready to go service so i can start offering calling services. I have two windows computers that i'm willing to use for this purpose and these are intel core 2 duo processors e4300(dual core 64bit processor with intel EM64T technology, each operates at 1.8 ghz shared mb L2 cache, 800mhz FSB, memory 2048 mb intel network cards 10/100, 320 GB hard drive. Please note that A2billing experience is required.