Abstract: Characteristics of an implementation of my full-duplex speakerphone system, comprising transmit and receive suppress units, and acoustic and line echo cancellers, are determined once during manufacturing. The determined characteristics include a “total suppression” the combination of which the suppress units and echo cancellers must continuously provide to maintain stability and a midpoint value relative to total suppression. During operation, the system compares near-end and far-end speech power to midpoint to determine which side is speaking. During far-end speech, the system dynamically determines if the acoustic echo canceller has diverged in performance and if so, resets the echo canceller.