sentences:  The virtual queuing system monitors the rate at which calls in queue are worked off and launches an outbound call to the customer moments before the virtual placeholder is due to reach the top of the queue.When the callback is answered by the customer, the system asks for confirmation that the correct person is on the line and ready to speak with an agent.Upon receiving confirmation, the system routes the call to the next available agent resource, who handles it as a normal inbound call.