Abandoned call control and indication

Details Abandoned call control and indication Abandoned call control and indication

1991-09-04

1995-12-12

Dwyer, James L.

Telephonic communications

Special services

Anonymous party

379 45, 379 67, 379204, H04M 342, H04M 1104, H04M 164

Patent

active

054757452

ABSTRACT:
A method and apparatus for holding a line busy from which a party has disconnected and providing an indication to the other party that the first party has hung up. The invention operates by receiving a call in a telephone switching office from a first subscriber on an incoming line destined for a second subscriber, storing an indication signal signifying that the call has been received; in case the first subscriber has hung up, accessing the indication signal, and as a result sending a signal to the second subscriber which is indicative that the first subscriber has hung up. Such systems are useful in emergency call handling systems, such as 911 emergency call systems.

REFERENCES:
patent: 3902021 (1975-08-01), Walker
patent: 4540850 (1985-09-01), Herr et al.
patent: 4653090 (1987-03-01), Hayden
patent: 4924491 (1990-05-01), Compton et al.
patent: 5095504 (1992-03-01), Nishikawa et al.

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