RTT that interworks with other RTT must support the applicable mechanism: (a) ITU-T V.18 at a PSTN interface; (b) IETF RFC 4103 over SIP-based VoIP (with the 3GPP specifications for IMS); (c) a published common specification, including a way to signal lost or corrupted characters, for other technologies; or (d) a newer RTT standard supported by all other active voice-and-RTT ICT in that environment.
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.