Request a feature update that will give agents making click 2 calls some feedback on their calls when the call to the customer does not connect; perhaps a message to be heard on the call, due to the agents number being blocked by a carrier, or the number is disconnect or out of service.
Currently for the agent the call just ends they don't hear the number is out of service or number cannot be reached message (calls blocked by the carrier have no message to be heard at all even when calling directly), and that causes them to think there is a technical issue with c2c instead of the number that are calling being the issue