Where VoLTE is offered, protect the IMS core and SIP signaling using TLS or IPsec, and isolate the IMS access network from general data sessions. Verify that calls fall back to circuit switched bearers only when necessary and that fallback is logged.
This control maps to 2 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 2 it maps to, and the evidence behind each claim, over MCP and REST.