9. A computer system for automated training for a router confidence engine in a call routing system, the system comprising: at least one processor and at least one memory encoded with instructions, wherein execution of the instructions by the at least one processor causes the at least one processor to: define a set of call routes for processing input speech utterances in a call routing system, each call route representing a specific call processing path; perform initial router confidence training based on an initial set of training data; operate the call routing system to assign input speech utterances to the defined call routes; collect adaptation training data based on processed input speech utterances; and re-perform router confidence training based on the adaptation training data, wherein each iteration i of the re-performing occurs when 2 i speech utterances for each call route are available.
9. A computer system for automated training for a router confidence engine in a call routing system, the system comprising: at least one processor and at least one memory encoded with instructions, wherein execution of the instructions by the at least one processor causes the at least one processor to: define a set of call routes for processing input speech utterances in a call routing system, each call route representing a specific call processing path; perform initial router confidence training based on an initial set of training data; operate the call routing system to assign input speech utterances to the defined call routes; collect adaptation training data based on processed input speech utterances; and re-perform router confidence training based on the adaptation training data, wherein each iteration i of the re-performing occurs when 2 i speech utterances for each call route are available. 16. The apparatus of claim 9 , wherein the at least one memory further includes instructions whose execution by the at least one processor causes the at least one processor to: train a statistical semantic classifier of the call routing system that classifies text representing the input speech utterances according to one of the defined call routes.