11. A system for developing query tags for classification of user queries to a call routing application, the system comprising: a plurality of user query corpuses containing user queries from a plurality of call routing applications in a plurality of different vertical domains; a query tag selection module for accessing the user query corpuses to select a set of frequent user queries that appear in a plurality of different query corpuses in a plurality of different vertical domains to develop frequent query tags for semantic classification of the frequent user queries; and a query tag database for storing the frequent query tags; wherein the user queries and the query tags are in a first language, and the system further automatically translates the user queries into a second language and stores the translated user queries with the frequent query tags in a call routing database for a call routing application in the second language.
12. A system according to claim 11 , wherein the query tag selection module further accesses the user query corpuses to select a set of common user queries that appear in a plurality of different query corpuses in a single common vertical domain to develop common query tags for semantic classification of the common user queries and store the common query tags in the query tag database.