A system for processing signals, comprising: an echo cancellation linear processing module (410,510) configured for generating a first output signal by adaptively filtering an input signal, the first output signal being the input signal with any linear echo reduced, the echo cancellation linear processing module comprising an echo cancellation operator for generating a residual echo signal by subtracting an estimated echo signal from the input signal, and a first complex adaptive filter configured for generating a first estimated echo signal based on a first reference signal and the residual echo signal, wherein the estimated echo signal is the first estimated echo signal; a nonlinear echo processing module (412,512) configured for generating a second output signal based on the first output signal, the second output signal being the first output signal with any residual linear echo or nonlinear echo reduced, the nonlinear echo processing module comprising a nonlinear echo determination module configured for determining whether nonlinear echo is present in the first output signal, a nonlinear echo gain module configured for assigning a nonlinear echo gain for reducing nonlinear echo based on whether nonlinear echo is present in the first output signal, and a nonlinear echo operator configured for applying the nonlinear echo gain to the first output signal in generating the second output signal; and an echo leakage prevention module (414, 514) configured for generating a third output signal based on the second output signal, the third output signal being the second output signal with echo leakage reduced, wherein the echo leakage prevention module comprises an echo leakage determination module configured for determining whether a root mean square value of the input signal is below a minimum input threshold, an echo leakage gain module configured for assigning an echo leakage gain for reducing echo leakage based on whether the root mean square value of the input signal is below the minimum input threshold, and an echo leakage operator configured for applying the echo leakage gain to the second output signal in generating the third output signal an echo cancellation linear processing module (410,510) configured for generating a first output signal by adaptively filtering an input signal, the first output signal being the input signal with any linear echo reduced, the echo cancellation linear processing module comprising an echo cancellation operator for generating a residual echo signal by subtracting an estimated echo signal from the input signal, and a first complex adaptive filter configured for generating a first estimated echo signal based on a first reference signal and the residual echo signal, wherein the estimated echo signal is the first estimated echo signal; a nonlinear echo processing module (412,512) configured for generating a second output signal based on the first output signal, the second output signal being the first output signal with any residual linear echo or nonlinear echo reduced, the nonlinear echo processing module comprising a nonlinear echo determination module configured for determining whether nonlinear echo is present in the first output signal, a nonlinear echo gain module configured for assigning a nonlinear echo gain for reducing nonlinear echo based on whether nonlinear echo is present in the first output signal, and a nonlinear echo operator configured for applying the nonlinear echo gain to the first output signal in generating the second output signal; and an echo leakage prevention module (414, 514) configured for generating a third output signal based on the second output signal, the third output signal being the second output signal with echo leakage reduced, wherein the echo leakage prevention module comprises an echo leakage determination module configured for determining whether a root mean square value of the input signal is below a minimum input threshold, an echo leakage gain module configured for assigning an echo leakage gain for reducing echo leakage based on whether the root mean square value of the input signal is below the minimum input threshold, and an echo leakage operator configured for applying the echo leakage gain to the second output signal in generating the third output signal