I need to send about 500 calls a day to a sip address, (~5000 mins per day) I then need those calls sent to 3 - 6 US DIDs  on a round robin approximate % basis.  

eg.       500 calls in 

DID 1  would receive approximately 33%  ~165  -- in any given hour about 20 calls

DID 2  would receive approximately 33%  ~165  -- in any given hour about 20 calls

DID 3  would receive approximately 33%  ~165  -- in any given hour about 20 calls

I'm happy to pay a hosting fee, and a rational termination fee per min.

I need this solution ASAP

thank you.