Every C/CSP monitors its network for scam voice traffic, using the indicators described in 4.1 and 4.2 (not an exhaustive list) together with the calling numbers notified by other providers or by government agencies as linked to suspected scam calls. How the monitoring is done is for each provider to decide.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.