Terminating call control method and system therefor in a digital

Details Terminating call control method and system therefor in a digital Terminating call control method and system therefor in a digital

1994-05-06

1995-06-27

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of centralized switching system

379 14, 379 15, 379 27, 370 13, 370 15, 370 16, H04M 124, H04M 308, H04J 314, H04J 116

Patent

active

054286611

ABSTRACT:
A terminating, or an incoming, call control method, in which a subscriber group constituted by a plurality of subscriber telephone sets respectively accommodated in, or connected to, a plurality of lower switching units and sharing a terminating call is set. A host switching unit parallelly accommodating the lower switching units is caused to monitor that a fault has occurred in at least one of the lower switching units. When a terminating call is made for one of the subscriber telephone sets accommodated in one lower switching unit, of the lower switching units, in which the fault has occurred, the host switching unit is caused to assign the terminating call to one fault-free lower switching unit which accommodates a given subscriber telephone set belonging to the same subscriber group as that of a call incoming destination subscriber telephone set in the subscriber telephone sets. The fault-free lower switching unit is caused to transfer the terminating call to the given subscriber telephone set belonging to the same subscriber group as that of the call incoming destination subscriber telephone set.

REFERENCES:
patent: 4365248 (1982-12-01), Bargeton
patent: 4442518 (1984-04-01), Morimoto
patent: 4680776 (1987-07-01), Ikeuchi
patent: 4878048 (1989-10-01), Gottesman
patent: 4996702 (1991-02-01), Gray
patent: 5001741 (1991-03-01), Sayer
patent: 5073774 (1991-12-01), Ikawa

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