Method of automatic trunk testing

Details Method of automatic trunk testing Method of automatic trunk testing

1977-05-06

1979-04-03

Olms, Douglas W.

179 7R, H04M 322

Patent

active

041479025

ABSTRACT:
A method of automatically detecting fraudulent telephone calls in telephone systems having a plurality of trunks served by automatic message accounting equipment. The trunks are normally scanned to detect changes in supervisory states for automatic message accounting purposes. When predetermined supervisory state sequences are detected at any one of the trunks, a special test control signal is generated and, responsive to the appearance of the special test control signal, the transmission path of the suspected trunk is seized to monitor whatever call signaling information may appear thereon during an interval when such signaling would not appear on a normal call to verify the existence of the fraudulent usage.

REFERENCES:
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patent: 2848543 (1958-08-01), Breed et al.
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patent: 3829627 (1974-08-01), Short et al.
patent: 3875351 (1975-04-01), Kennedy
patent: 4001513 (1977-01-01), Naylor
Bell Lab Record Jun. 1956, "CAMA-Automatic Trunk-Test Circuit" pp. 223-226 by Dusenberry.

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