The aim of this Recommendation is to define use cases and test methods for narrow-band handsfree communication in vehicles. This Recommendation covers: ?C build-in hands-free systems; ?C after-market hands-free car kits; ?C corded headsets; and ?C wireless headsets; to be used in vehicles for communication while driving. This Recommendation addresses the test of complete systems as well as the subsystems of hands-free microphone and telephone with short-range wireless transmission link used to interconnect the hands-free system to the mobile network. For testing@ the test setup 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.50]@ [ITU-T P.501]@ [ITU-T P.502]@ [ITU-T P.340] and [ITU-T P.380].