Anti-spoofing techniques for outbound telephone calls
US10412217B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 2019 |
| Grant date | Sep 10, 2019 |
| Priority date | — |
| Expiry date | Apr 11, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2203/6027
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Techniques are disclosed for verifying a caller ID field of an outbound telephone call. A termination service provider call server receives a call request from a calling endpoint that includes a called endpoint telephone number, and a caller ID telephone number. The termination service provider call server determines a calling endpoint telephone number assigned to the calling endpoint and creates an “in use” message comprising the calling endpoint telephone number and a timestamp of when the call request was received. The “in use” message is forwarded to an active call database before forwarding the call request to an inbound carrier call server servicing the called endpoint telephone number. The inbound carrier call server receives the call request intended and sends a query to the active call database to determine whether the caller ID telephone number in the call request is currently in use. The active call database sets the status of telephone numbers contained in all received “in use” messages to in use. It then determines whether the caller ID telephone number received in the query from the inbound carrier call server corresponds to a telephone number that is currently in use…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.