Interruption of a call between two terminals by a call from another terminal
US5930347A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Jul 22, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/085
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of interrupting a call established via an analog link between two terminals via a switching center, whether the call is telephonic, telematic or a combination of the two, comprises the transmission of a user alerting signal and a terminal alerting signal from the switching center to one of the terminals. Between these signals the call between the terminals is re-established. To detect the terminal alerting signal the terminal searches during a predetermined period for a pattern transmitted by the switching center comprising in succession a first silence signal with a power less than a predetermined power during a first predetermined period of silence, the terminal alerting signal, and a second silence signal during a second predetermined period of silence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.