Communication terminal unit for connection to an ISDN

Details Communication terminal unit for connection to an ISDN Communication terminal unit for connection to an ISDN

1991-09-09

1993-02-23

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

At substation

3701101, 370 941, 379 95, 379100, H04M 166, H04M 1100, H04J 312, H04J 324

Patent

active

051896958

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.

REFERENCES:
patent: 4961185 (1990-10-01), Sawada
patent: 4998248 (1991-03-01), Matsuzaki
patent: 5018191 (1991-05-01), Catron
patent: 5050005 (1991-09-01), Kagami
Xerox 3010 Facsimile Terminal Operator Manual, May 1990.

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