Charge time start control for interconnect PABX

Details Charge time start control for interconnect PABX Charge time start control for interconnect PABX

1983-02-28

1984-09-18

Schreyer, Stafford D.

H04M 1518

Patent

active

044726007

ABSTRACT:
In an interconnect PABX, 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.

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