State machine profiling for voice over IP calls
US9438641B2 · kind B2 · utility
2Cited by
11References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 2008 |
| Grant date | Sep 6, 2016 |
| Priority date | — |
| Expiry date | Dec 4, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2201/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for detecting potentially-improper call behavior (e.g., SPIT, etc.) are disclosed. The illustrative embodiment of the present invention is based on finite-state machines (FSMs) that represent the legal states and state transitions of a communications protocol at a node during a Voice over Internet Protocol (VoIP) call. In accordance with the illustrative embodiment, a library of FSM execution profiles associated with improper call behavior is maintained. When there is a match between the behavior of a finite-state machine during a call and an execution profile in the library, an alert is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.