1. A computing system for analyzing a telephone call to assess a classification of the telephone call, the computer system comprising: a memory for storing programmed instructions; and a processor configured to execute the programmed instructions to perform operations including: identifying a telephone call to monitor; determining a domain or entity associated with the identified telephone call; loading one or more grammars for the determined domain or entity, wherein the one or more grammars contain one or more keywords and associated parameters that are correlated with a likelihood of a particular classification for telephone calls in the domain or entity; receiving an audio signal of the identified telephone call, wherein the audio signal of the telephone call is not transcribed in its entirety; using the one or more loaded grammars to monitor the received audio signal and identify one or more keywords and associated parameters that are present in the received audio signal; loading a statistical model to determine the classification of the identified telephone call; using the loaded statistical model to determine the classification of the identified telephone call based at least on the identified keywords and associated parameters; and outputting, by the computing system, the determined classification.