Telephonic communications – Call or terminal access alarm or control – At switching center
Patent
1997-03-19
1999-02-16
Hong, Harry S.
Telephonic communications
Call or terminal access alarm or control
At switching center
379201, 379207, 379230, H04M 300, H04M 166, H04M 342, H04M 700
Patent
active
058728406
ABSTRACT:
An application module associated with a terminating telecommunication exchange serving a particular called party subscriber maintains data reflecting the number of call setups attempted by a calling party subscriber toward the restricted or barred called party subscriber. In case the number of call setups attempted by the calling party subscriber within a predefined time period reaches a certain threshold level, an incoming call connection is effectuated toward the otherwise restricted called party subscriber. As a result, even if the called party subscriber has a do not disturb (DND) call barring subscriber feature activated, emergency or urgent calls repeatedly made toward the called party subscriber are allowed to be terminated thereto.
REFERENCES:
patent: 3784721 (1974-01-01), Kilby
patent: 3793487 (1974-02-01), Kilby
patent: 4893329 (1990-01-01), O'Brien
patent: 5327488 (1994-07-01), Garland
patent: 5357564 (1994-10-01), Gupta et al.
patent: 5495521 (1996-02-01), Rangachar
patent: 5524145 (1996-06-01), Parker
Ericsson Inc.
Hong Harry S.
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