Telephone call saving system and method for an integrated servic

Details Telephone call saving system and method for an integrated servic Telephone call saving system and method for an integrated servic

1994-06-22

1995-11-21

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of centralized switching system

379190, 379191, 379192, 379193, H04M 124, H04M 300

Patent

active

054694930

ABSTRACT:
A call saving system for an ISDN telephone switching system includes a subscriber switching unit and terminal units connected to the subscriber switching unit via subscriber lines. A control device controls an overall call saving process executed between the subscriber switching unit and each terminal unit when a restart process is started after a call process is temporarily stopped. When a restart process is started, a restart message is transmitted to each terminal units on the basis of the presence/absence of a call to be saved. Each terminal unit includes a call state setting circuit for a state display message when information indicating a confirmation of a call saving is set in the restart message.

REFERENCES:
patent: 2676209 (1954-04-01), Joel, Jr.
patent: 3821718 (1974-06-01), Padgeti
patent: 3889070 (1975-06-01), Oatis et al.
patent: 4847893 (1989-07-01), Dang
patent: 4942601 (1990-07-01), Park
patent: 4974164 (1990-12-01), Ardon
patent: 5345503 (1994-09-01), Lee

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