The aim of this Recommendation is the definition of user scenarios@ test methods and requirements for wideband hands-free communication in motor vehicles. This Recommendation covers: ?C built-in hands-free systems@ ?C aftermarket hands-free car kits@ ?C corded headsets@ and ?C wireless headsets to be used in motor vehicles for communication. Furthermore@ the compatibility between narrowband and wideband implementations is addressed. This Recommendation addresses the test of complete systems as well as the subsystems hands-free microphone@ and the telephone with short-range wireless transmission link used to transmit the speech signals from the hands-free system to the mobile network. For testing purposes@ the test set-up and the recommended environmental conditions are described. The methods@ the analysis and the performance parameters described in this Recommendation are based on test signals and test procedures@ as defined in [ITU-T P.501]@ [ITU-T P.502]@ [ITU-T P.340]@ [ITU-T P.380]@ [b-ETSI ES 202 739]@ and [b-ETSI ES 202 740]. Although important subjective testing is outside the scope of this Recommendation@ guidance on how to conduct subjective tests can be found in clause 14.