1. A speech enhancement system that enhances transitions between speech and non-speech segments comprising: a background noise estimator that approximates the magnitude of a background noise of an input signal comprising a speech segment and a non-speech segment; and a slave processor configured to perform the specialized tasks of: modifying a spectral tilt of the input signal; performing a comparison between the modified input signal and a plurality of expected spectral shapes that are supported by a Codec; and selecting, based on the comparison, a spectral shape of the plurality of expected spectral shapes for transmission over a wired or wireless medium.