VoIP fraud prevention and toll-fraud controls

VoIP fraud commonly exploits stolen credentials, exposed administration, weak dial plans, compromised endpoints, or unmonitored international and premium-rate routes.

High-value controls

• Restrict SIP and administration to known networks where practical.
• Use strong unique credentials and secure provisioning.
• Disable unused accounts, routes, and destinations.
• Apply time-of-day, spend, concurrency, and rate limits.
• Alert on unusual destinations, bursts, failed authentication, and after-hours activity.
• Separate operator, user, and administrator permissions.
• Maintain an incident process that can suspend routes quickly.

Do not rely on a single country block or a hidden SIP port. Layer controls and test alert delivery.

Related: SIP registration, SBCs, and monitoring.