Abstract: An information retrieval system for voice-based applications enabling voice based content search is provided. The system comprises a remote communication device for communication through a telecommunication network, a data storage server for storing data and an adaptive indexer interfacing with a speech recognition platform. Further the adaptive indexer is coupled to a content extractor. The adaptive indexer indexes the contents in configured manner and the local memory stores the link to the indexed contents. The speech recognition platform recognizes the voice input with the help of a dynamic grammar generator and the results thereof is encapsulated into a markup language document. Employing the speech recognition results a search is performed by a search engine using the indexed contents and the results is returned to the originator of the search input. Systems are provided to perform the methods.