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Abstract

A call progress monitor and algorithm for placing a phone call over the phone lines. The algorithm is hierarchically arranged having three major routines or portions: tone detection, signal recognition and situation recognition. Based upon the definitions stored in a memory and the commands, the call progress monitor algorithm is applied to the telephone audio data. The call progress monitor algorithm is controlled by a host computer which sends a Recognize Situation Command and expects to receive some time later, a Recognize Command Termination Report. The tone detection portion of the algorithm measures the power at each of a predetermined number of frequencies of interest. The signal recognition portion of the algorithm detects the presence of a particular signal. A signal is a particular tone or set of tones that are uniquely present (while all other tones are absent). Furthermore, a signal has qualifying requirements of signal to noise ratio (SNR), twist, and noise variance, that must be met to define a particular signal. The situation recognition portion of the algorithm determines that a certain sequence or pattern of signals has occurred with a particular timing or cadence. When a match to a particular desired condition specified in a situation definition is made, a success is reported in the Recognize Command Termination Report. Otherwise, a failure is reported, together with the condition detected which elicited the failure response.

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