1. A method for predicting business outcomes based upon recorded telephone calls, the method comprising the following steps: recording a series of telephone calls of individuals calling a business, processing the recorded telephone calls as sound files, extracting various audio features from each of the telephone calls, building a feature matrix whereby a plurality of extracted audio features are tabulated; determining whether the telephone calls resulted in a pre-determined business outcome, annotating the feature matrix by indicating whether the pre-determined business outcome was achieved, establishing a model whereby the pre-determined business outcome is associated with a subset of the extracted audio features; recording additional telephone calls from individuals calling the business, processing the additional telephone calls as sound files, extracting various audio features from each of the sound files, predicting whether the pre-determined business outcome will occur based upon the established model, ranking the additional telephone calls based upon the prediction; determining whether each additional telephone call resulted in the actual occurrence of the pre-determined business outcome, comparing the actual occurrence with the prediction and modifying the established model on the basis of the comparison.