1. A voice processing system, comprising: a real-time voice server, which is arranged to process real-time voice processing tasks for clients of the system; and a gateway processor, which is arranged to accept from a client a request to perform an off-line voice processing task, to convert the off-line voice processing task into an equivalent real-time voice processing task, to invoke the voice server to process the equivalent real-time voice processing task, and to output a result of the equivalent real-time voice processing task.