Methods are described for processing voice messages, for deactivating DTMF coding, and for processing a request to deactivate DTMF coding. The method for processing voice messages using a terminal includes sending a request to a voice server to be interpreted by the server to deactivate DTMF coding on a communication channel between the server and the terminal, receiving, from the server, a datum relating to the terminal's configuration, interpreting the configuration datum and applying to the terminal a configuration mode obtained from the interpretation, and processing voice messages using the terminal according to the configuration mode.