This Specification defines test methodologies for and standard behaviour of subsystems used in automotive speakerphone terminals. The purpose is to provide guidance on the design and optimization of subsystems as well as diagnostic capabilities needed to give a consistent and high Quality of Service of the overall speakerphone terminal for the users of such devices. This specification is intended to give guidance to all parties involved in the design and integration of speakerphone terminals. This specification covers both, narrowband and wideband systems.