A new relational paradigm is proposed that is based on voice shapes, which represent the speech style used to establish an effective communication. The following voice shapes are defined: “rounded”, which means that a colloquial and empath communication is established; “triangular”, which means transmitting energy, joy and interest; “squared”, which highlights competence and solidity. These functional shapes can be strengthened by the additive component “heart”, which emphasizes relational quality and the transmitted emotions. Two dysfunctional shapes are also defined: “flat”, which is a monotone style that does not capture the listener attention; “spiky” or “X”, which is an aggressive style that transmits anger or blame towards the listener and does not match relational standards. An attempt has been made to match the voice shapes to acoustic parameters of the vocal signal, starting from 200 different-shape recordings. Such recordings have been processed in order to extract several voice features, such as the histograms of occurrences of: voiced and unvoiced periods; fundamental frequency; intensity; Cepstral Peak Prominence Smoothed. Preliminary results have shown a good discrimination power among the voice shapes using four parameters: 5th percentile and kurtosis of CPPS distribution, mode of unvoiced-period distribution and standard deviation of intensity distribution.