This Recommendation describes performance requirements and test methods for narrowband hands-free communication in vehicles. The Recommendation covers - build in hands-free systems, - after market hands-free carkits, - corded headsets and - wireless headsets to be used in vehicles for communication while driving. The 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 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 Recommendations P.50, P.501, P.502 and P.340, P.380.