1. A radio-to-Session Initiation Protocol (SIP) adapter comprising: a voice detection algorithm processor to detect the presence of human speech in an audio signal, the processor segregating the audio signal into a plurality of signals having various frequencies within each signal bandwidth and feeding the plurality of signals into syllabic detection decision logic to determine the presence of human speech, the processor comprising: bandpass filters to provide the plurality of signals having various frequencies; a first set of envelope detectors to average signals received from the bandpass filter, each detector of the first set of envelope detectors being coupled to the output of a respective one of the bandpass filters; low pass filters, each low pass filter being coupled to the output of a respective one of the envelope detectors; and a second set of envelope detectors, each of the detectors of the second set of envelope detectors being coupled to the output of a respective one of the low pass filters; the syllabic detection decision logic coupled to the outputs of the second set of envelope detectors and configured to use time and amplitude thresholds of the signals received from the second set of enveloped detectors to determine the presence of human speech based on prior known human speech; an audio input to receive an audio signal; and a radio transmit indicator signal output to provide a signal to indicate that human speech is present in the audio signal to activate a transmitter to transmit the audio signal.