1. A voice processing system comprising: a plurality of voice processing components for recording and playing back audio messages; a speech detector, arranged to analyze a signal being received over a telephone line from a remote user, and to detect whether speech is present in the signal being received; a tone detector, arranged to analyze the signal being received over the telephone line from the remote user, and for informing said one or more voice processing components when the tone detector detects any one of a plurality of predetermined tones in the signal being received; and means responsive to said speech detector detecting speech in said signal being received for preventing said tone detector from informing said one or more voice processing components when the tone detector detects at least one of the plurality of predetermined tones and only if said voice processing system is recording the audio messages.