Look for Prepaid Calling Card Software

Hi,

I have some problem in finding a prepaid calling card billing software that would allow us to let the customer to recharge their existing prepaid calling card through the phone using their credit card at real time (24/7). I have looked at PortaOne, MindCTI and Sysmaster, but they couldnt provide the function that our company want. Does anyone got an idea which software can allow top-up of the card using credit card THROUGH THE PHONE AT REAL TIME? Thank you very much!