ISO 20109:2016 specifies requirements for equipment used for simultaneous interpreting. Accessibility requirements are defined in Annex A. Requirements for booths furniture are defined in Annex B. Requirements on the system operation are defined in Annex C. In conjunction with either ISO 2603 or ISO 4043, ISO 20108 and this document provide the relevant requirements both for the quality and transmission of sound and image provided to interpreters and for the equipment needed in the booths.