8.2.1.1: hardware with speech output must allow the speech volume to be adjusted across 18 dB or more (fixed-line handsets and headsets meeting ANSI/TIA-4965 are deemed to comply). 8.2.1.2: where volume control is incremental, at least one intermediate step must give 12 dB gain above the lowest setting.
This control maps to 1 controls across 1 other frameworks. If you already hold one of them, the evidence you collected for it is the starting point here rather than new work.
Every mapping shown was judged rather than inferred from wording similarity, and the ones that failed review are published too. See the coverage reports and what was rejected.
The graph holds this control, the 1 it maps to, and the evidence behind each claim, over MCP and REST.