Using the telecom company's system for real-time detection of phone calls to directly locate the scam source and freeze it immediately.
Unusually high calling frequency and abnormal call duration. Legitimate companies can be added to a whitelist, or a company contact person can regularly provide monthly explanations to confirm business usage.
Calling a large number of people in a single day with no geographical correlation. Some calls have extremely short or extremely long connection times, which indicates scam activity. A normal salesperson cannot perform multiple conversations longer than 30 minutes.
- 60%–80% of calls are hung up immediately
- Several calls will repeatedly last more than 10–20 minutes (even one such call can be distinguished from normal business usage, because even if a salesperson wants to introduce a service or product, there is not so much content to talk about)
- Numbers that continue calling after normal business hours
In summary, scam prevention should be based on behavioral patterns of scam calls.