Patent
1985-03-21
1986-10-07
Schreyer, Stafford D.
H04M 1518
Patent
active
RE0322636
ABSTRACT:
In an interconnect [PABX], telephone equipment which does not have an answer signal returned thereto, decision logic makes use of returned audible busy and ring-back signals to determine if a connection extended through a telephone utility network to a called station is completed.
REFERENCES:
patent: 3721769 (1973-03-01), Krock et al.
patent: 4063037 (1977-12-01), Heffernan et al.
patent: 4090034 (1978-05-01), Moylan
patent: 4410765 (1983-10-01), Hestad et al.
Haas George E.
RCA Corporation
Schreyer Stafford D.
Seligsohn George J.
Tripoli Joseph S.
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