Telephonic communications – Supervisory or control line signaling – Substation originated
Patent
1992-04-30
1994-07-05
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Substation originated
379283, 379354, 379386, 379351, 379 95, 379199, 3701101, H04M 100
Patent
active
053274920
ABSTRACT:
A method for monitoring a network communications channel to detect specific DTMF triggers transmitted by a network user during either a pre-answer or a post-answer period of a call supported by the channel, and, in response to the detected DTMF triggers, controllably prohibiting the propagation of subsequent DTMF signals transmitted over the channel by the network user. Specifically, possible disruption of a communication between the network user and other parties caused by transmission of DTMF signals is eliminated by advantageously transmitting the DTMF triggers during the pre-answer period of a call. Furthermore, another deficiency of prior network-based arrangements for restricting the propagation of DTMF signals is overcome, as the invention may be practiced without the introduction of any significant propagation delay to a network.
REFERENCES:
patent: 4219699 (1980-08-01), Nilssen et al.
patent: 4621354 (1986-11-01), Jones, Jr. et al.
patent: 4626628 (1986-12-01), Ramsaran et al.
patent: 4866762 (1989-09-01), Pintar
patent: 5063563 (1991-11-01), Ikeda
AT&T Bell Laboratories
Dwyer James L.
Marley R. P.
Saint-Surin Jacques M.
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