Communication terminal unit for connection to an
US5189695A · kind A · utility
12Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1991 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Sep 9, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/179
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to communication terminal units connected to an ISDN (Integrated Services Digital Network), and more particularly to a communication terminal unit whose response is limited by a user number, a subaddress and ability specification information included in a call set-up signal sent from a calling terminal. The communication terminal unit of the invention allows an identification code common to terminals in each department to be added, thereby simplifying the number management.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.