Method of transmitting dual tone multi-frequency during communic

Details Method of transmitting dual tone multi-frequency during communic Method of transmitting dual tone multi-frequency during communic

1989-06-30

1990-03-06

Brown, Thomas W.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

379353, H04M 322, H04Q 150

Patent

active

049072625

ABSTRACT:
A dual-tone multi-frequency (DTMF) transmission method to allow a keyphone user of a private branch exchange system (PBX) to send the DTMF signal according to dial digits depressed, through a DTMF sender built in the PBX itself, even though there is no DTMF generator in the keyphone on use, when the keyphone user needs to send the DTMF signal to the central office (C.O.) line to control devices that operate at reception of the DTMF signal during making a call to the C.O. line. The method comprises a plurality of control steps operated according to a flow chart of the attached figure.

REFERENCES:
patent: 3790719 (1924-02-01), Montague et al.

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