Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1997-01-16
1998-08-04
Zele, Krista
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379377, 379382, 379413, H04M 1900
Patent
active
057906530
ABSTRACT:
The invention provides a method for detecting a call progress tone on a pair of telephone conductors (the telephone line). The level of energy stored in an energy storage device is continually checked. When the level of energy of the energy storage device is below a threshold, the system couples the telephone line to an off-hook impedance. While coupled to the telephone line, the system charges the energy storage device using current drawn from the telephone line, and the system detects the presence of the call progress tone on the telephone line.
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Chandler, Maryann, Editor; "US WEST To Offer Message Waiting Indication--Visual"; US WEST On A Newsletter Jan. 1991, pp. 2-6; Seattle, WA.
Fairbanks Scott M.
Fairbanks, Sr. John P.
Saint-Surin Jacques M.
VoiceWaves, Inc.
Zele Krista
LandOfFree
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