ICT delivering sound, including required speech output, provides volume control and amplification (not required where 412.2 is met). For private listening a volume control mode is provided and, for output held to the ear, magnetic wireless coupling to hearing technologies (402.3.1). For non-private listening, incremental volume control with amplification up to at least 65 dB and an automatic reset to the default level after every use (402.3.2).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.