Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent
1995-02-27
1996-07-09
Hofsass, Jeffery
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
379 88, 379194, 379212, 379213, 379258, 379277, H04M 700, H04M 164, H04M 300, H04M 342
Patent
active
055352693
ABSTRACT:
An additional direct inward dialing connection system includes a determining section, announcement machines, and a connection control section. When a direct inward dialing number from a caller is received via an office line or public telephone network, the determining section determines on the basis of the state of a called station terminal whether connection to the called station terminal can be established. When an output from the determining section indicates that connection to the called station terminal is not possible, one of the announcement machines notifies the caller of the reason for connection failure based on the state of the called station terminal. The machine also announces the number of a station terminal that may additionally dialed. When the number of the station terminal is received upon additional dialing performed by the caller, the connection control section connects a call from the caller to the station terminal corresponding to the received number.
REFERENCES:
patent: 4926462 (1990-05-01), Ladd et al.
patent: 4969182 (1990-11-01), Ohtsubo et al.
Hofsass Jeffery
Hong Harry S.
NEC Corporation
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