A predictive model for abandoned calls provided by a contact center communication system for routing optimization is described along with various methods and mechanisms for administering the same. Based on multiple attributes, the system can calculate the probabilities, risks, and costs associated with abandonment and wait, taking into account the patience of a caller, region where the caller lives, agents available to handle the call, length of time that the caller has already been waiting, potential cost of having the caller and call type abandon, and potential total cost of having the caller wait to be served.