The invention provides a voice telecommunication terminal device (1) configured for being used for voice communication, wherein the voice telecommunication terminal device (1) comprises: a microphone (2) configured for converting a voice of a user (VO) into an electrical voice signal (VS); a voice modifier (3) configured for modifying one or more vocal parameters of at least one portion of the voice signal (VS) in order to produce a vocally modified voice signal (MVS); and a telecommunication interface (4) configured for connecting the voice telecommunication terminal device (1) to a telecommunication network (TN) and for transmitting the vocally modified voice signal (MVS) to the telecommunication network (TN).