A method of simultaneously transforming at least two input voice signals xi of a communications system (30), each input voice signal xi being received at a specific reception frequency Fi and corresponding to the voice of a remote party communicating with a user of the communications system (30). During an initialization stage, a transformation Ti is allocated to at least one reception frequency Fi of the input voice signals xi, and during a utilization stage, transformations Ti are applied simultaneously to the input voice signals xi as a function of the reception frequencies Fi, modifying at least one characteristic of each of the input voice signals xi. Thus, the voice of each remote party in communication with the user of the communications system (30) is modified artificially by a transformation Ti, thereby making it easier for the user to perceive and discriminate between simultaneous voices from the remote parties.