Agencies should: have VoIP phones authenticate to the call controller at registration; switch off auto-registration of phones and admit only authorised devices on an allow list; block devices that are not authorised by default; turn off every unused and prohibited function; and require each IP phone user to have an individual login.
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.