Two-way voice modes also carry two-way real-time text unless that would mean adding display or keyboard hardware the product would not otherwise have (devices that can connect such hardware are covered), and voice and text can be used together over a single connection. India notes that when a user has chosen an Indian language text should use the language being spoken, and accepts that basic feature phones may lack RTT.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.