1. A computer-implemented method employing at least one hardware based computer processor to develop query tags for classification of user queries to a call routing application, the method comprising: accessing a plurality of user query corpuses containing user queries from a plurality of call routing applications in a plurality of different vertical domains; selecting a set of frequent user queries that appear in a plurality of different query corpuses in a plurality of different vertical domains; developing frequent query tags for semantic classification of the frequent user queries; and storing the frequent query tags in a query tag database; wherein the user queries and the query tags are in a first language, and the method further comprises: automatically translating the user queries into a second language; and storing the translated user queries with the frequent query tags in a call routing database for a call routing application in the second language.