Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path
US6141406A · kind A · utility
114Cited by
21References
66Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 30, 1997 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | May 30, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/54
- 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.