macaruchi wrote:When I dial these numbers the ring status is passed to the agents
I must assume from this that you mean "agents hear ringing instead of a human voice". If that's not the case, please try again, perhaps I'll get it this time.
If your agents ARE hearing ringing after being passed a call: You are being ripped off. Your carrier (or someone above them in the food chain) is FAKE answering the calls, passing an ANSWER signal to the dialer, and then playing a ring-tone audio file. This is a violation of your contract with your carrier and a blatant ripoff as they are now charging you for a call that was never actually passed to the called party.
Of course, they could also be detecting a fake callerid (if you're using one) and ripping you off in reverse if they believe you are illegally robodialing. In either case: Verify that you are in fact using an outbound CallerID that you own (makes this a real call) and then complain to your carrier that you will not be paying for these calls and that you want the carrier to stop routing calls through whichever upline they are sending them. Present them with detailed logs showing the number dialed, date/time/timezone and length of call. They should "UNbill" you for these calls.
Oh: And get a second carrier now if you don't have one (third if you can, since they don't have monthly fees! doesn't cost extra to have multiple carriers, you pay by the minute not by the connection).