Electronic switching system for use in connection to an
US5305313A · kind A · utility
5Cited by
4References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1992 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Jul 6, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/27
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An electronic switching system having ISDN interfaces on the extension side stores in a table the attributes of a terminal under communication using the ISDN interface. When there is another incoming call to the ISDN interface, the system waits for a response to the incoming call by the terminals connected to the ISDN. When no response is received, the switching system creates a disconnection reason message on the basis of the result of checking the terminal attributes in the table against the attributes of the incoming call. This disconnection reason message is then communicated to the calling terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.