Telephone control device

Details Telephone control device Telephone control device

1987-03-06

1988-04-12

Schreyer, Stafford D.

Telephonic communications

With usage measurement

Call traffic recording by computer or control processor

379355, 379393, 379387, H04M 172, H04M 1500

Patent

active

047379812

ABSTRACT:
A combination of fixed frequency audio tones and conventional dual tones (as generated by a DTMF telephone set), are used in the autoline control circuit of the invention. All tones are generated by the DTMF telephone set to systematically provide functions available to the subscriber without need for quad conductors in the in-house telephone line and mechanical disconnects. Low cost integration of the present invention into existing FCC tarriffed DTMF equipment and systems without adverse effects is a paramount requirement as the above-mentioned functions are carried out. Conventional jacks and plugs are used to place the parallel autoline circuit of the invention in parallel with the DTMF telephones and the conventional in-premises line connector.

REFERENCES:
patent: 4459434 (1984-07-01), Benning et al.
patent: 4578540 (1986-03-01), Borg et al.

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