You need to let your clients to conveniently see what DIDs you have to sell and
let them sell it.
You need to be able to calculate cost for Toll Free calling based on ANI and
You can manipulate ANI and DNIS during the routing. For example, you can make
calls to one DID to be routed to another Number.
You need to be able to calculate billing for DID vendor and clients.
You need to specify on a per DID level how each DID is to be routed to which