Voice fraud (CLI spoofing, traffic pumping, premium-rate abuse) is a known telecom threat. CM.com applies a layered approach: encrypted calling, configurable guardrails (allow/blocklisting, premium-destination blocking, cost thresholds), default CLI-abuse blocking, and operational monitoring.
By default, CM.com blocks CLIs known to be used for spoofing (e.g. impersonating banks, government or insurers). Offending traffic is blocked automatically. Continued abuse can lead to account blocking. A customer legitimately owning a flagged number must provide proof of ownership before it can be allowed.
Guardrails give control over outbound voice traffic to limit financial exposure and abuse. They can be configured per individual SIP account in the Voice Management app: allowlisting (whitelisting) destinations, blocklisting (blacklisting) destinations, and blocking on a cost / price-per-minute threshold.
Allowlisting
Allowlisting (whitelisting) exclusively allows calls to specific destinations. Calls to any destination not on the allowlist are not permitted. Configured per prefix and per individual SIP account in the Voice Management App.
Blocklisting
Blocklisting (blacklisting) prevents calls to specified destinations. It can be done per prefix or based on a price/minute (cost) threshold, and specified per individual SIP account. Clicking an existing blacklisted destination lets you add/remove prefixes.
Cost tresholds
To cap fraud exposure, it is possible to blacklist destinations on a price/minute (cost) threshold. Any destination whose per-minute rate exceeds your configured limit is blocked. Set per SIP account in the Voice Management App (“Blacklisting on cost threshold”).