Apparatus providing enhanced echo suppression in a conferencing system having at least one microphone and at least one speaker, the apparatus comprising: at least one microphone input receiving at least one microphone input signal from the at least one microphone; at least one speaker input providing at least one speaker input signal for the at least one speaker; at least one processor having at least one primary echo-suppressor, the at least one primary echo-suppressor receiving (i) the at least one microphone input signal and (ii) the at least one speaker input signal, the at least one primary echo-suppressor providing at least one echo-suppressed microphone signal; and the at least one processor having at least one secondary echo-suppressor, the at least one secondary echo-suppressor receiving the at least one echo-suppressed microphone signal and providing an output signal; characterised in that: the at least one primary echo-suppressor comprises at least one echo estimate processor configured to: receive the at least one microphone input signal and the at least one speaker input signal, and generate at least one speaker echo estimate signal; the at least one primary echo-suppressor is configured to generate the at least one echo-suppressed microphone signal by using the at least one speaker echo estimate signal; and the at least one secondary echo-suppressor is configured to receive a further input consisting of: either (i) the at least one speaker echo estimate signal; or (ii) the at least one microphone input signal, wherein the at least one secondary echo-suppressor is configured to generate the output signal from the at least one echo-suppressed microphone signal using either the at least one speaker echo estimate signal or at least one approximation speaker echo estimate signal derived from the received at least one microphone input signal. at least one microphone input receiving at least one microphone input signal from the at least one microphone; at least one speaker input providing at least one speaker input signal for the at least one speaker; at least one processor having at least one primary echo-suppressor, the at least one primary echo-suppressor receiving (i) the at least one microphone input signal and (ii) the at least one speaker input signal, the at least one primary echo-suppressor providing at least one echo-suppressed microphone signal; and the at least one processor having at least one secondary echo-suppressor, the at least one secondary echo-suppressor receiving the at least one echo-suppressed microphone signal and providing an output signal; characterised in that: the at least one primary echo-suppressor comprises at least one echo estimate processor configured to: receive the at least one microphone input signal and the at least one speaker input signal, and generate at least one speaker echo estimate signal; the at least one primary echo-suppressor is configured to generate the at least one echo-suppressed microphone signal by using the at least one speaker echo estimate signal; and the at least one secondary echo-suppressor is configured to receive a further input consisting of: either (i) the at least one speaker echo estimate signal; or (ii) the at least one microphone input signal, wherein the at least one secondary echo-suppressor is configured to generate the output signal from the at least one echo-suppressed microphone signal using either the at least one speaker echo estimate signal or at least one approximation speaker echo estimate signal derived from the received at least one microphone input signal. the at least one primary echo-suppressor comprises at least one echo estimate processor configured to: receive the at least one microphone input signal and the at least one speaker input signal, and generate at least one speaker echo estimate signal; receive the at least one microphone input signal and the at least one speaker input signal, and generate at least one speaker echo estimate signal; the at least one primary echo-suppressor is configured to generate the at least one echo-suppressed microphone signal by using the at least one speaker echo estimate signal; and the at least one secondary echo-suppressor is configured to receive a further input consisting of: either (i) the at least one speaker echo estimate signal; or (ii) the at least one microphone input signal, wherein the at least one secondary echo-suppressor is configured to generate the output signal from the at least one echo-suppressed microphone signal using either the at least one speaker echo estimate signal or at least one approximation speaker echo estimate signal derived from the received at least one microphone input signal. either (i) the at least one speaker echo estimate signal; or (ii) the at least one microphone input signal, wherein the at least one secondary echo-suppressor is configured to generate the output signal from the at least one echo-suppressed microphone signal using either the at least one speaker echo estimate signal or at least one approximation speaker echo estimate signal derived from the received at least one microphone input signal.