5. The call router of claim 2 , wherein the processor is configured to perform additional functions, including functions to detect the classes based on class definitions including words defined for each class.
5. The call router of claim 2 , wherein the processor is configured to perform additional functions, including functions to detect the classes based on class definitions including words defined for each class. 6. The call router of claim 5 , wherein the processor is configured to perform additional functions, including functions to recognize the words using a class-based statistical language model (SLM) trained based on the class definitions.