Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path
US7136471B2 · kind B2 · utility
13Cited by
28References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 2004 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | Nov 19, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2203/5018
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for detecting whether a remote party has added a secondary telephone destination to a telephone call, for example through the activation of three-way calling service, conference calling or two lining bridging, by identifying an echo characteristic to the telephone connection between the local and the remote telephone and monitoring the echo characteristic to determine whether there is a significant change. The addition of a secondary telephone destination can be verified by continuing to monitor the echo characteristic to determine whether it has returned to its original value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.