Abstract: A radiotelephone system for motor vehicles, including a transducer for remote pickup, processing and transmitting of the speech of a user located in an environment with interference and a module for recognition of a control vocabulary by a user of the various operating modes of the system, a central processing unit connected to the speech recognition module and to a package of memories to control automatic dialing of telephone numbers of the radiotelephone in response to the recognition by the speech recognition module of the numbers or key words associated with stored telephone numbers, a module for synthesis of set speech suitable for generating, under the control of the central processing unit, permanently stored messages, a module for recording of nonpermanent voice messages from the speech transducer or from the radiotelephone and for playback of the messages by means of the radiotelephone or other voice data restoring circuits in the user environment, a selection unit for selecting predetermined modes o