1. A method of identifying an acoustic environment of a caller, the method comprising: analyzing acoustic features of a received audio signal from a caller; receiving meta-data information; classifying a background environment of the caller based on the analyzed acoustic features and the meta-data; selecting an acoustic model matched to the classified background environment from a plurality of acoustic models, each of the plurality of acoustic models being generated for a particular predefined background environment; and performing speech recognition on the received audio signal using the selected acoustic model.