Call progress decoder for multiple cadenced tones on telephone lines
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United States of America Patent
Stats
-
Jan 9, 1996
Issued Date -
N/A
app pub date -
Nov 1, 1993
filing date -
Dec 21, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for detecting single and/or multiple cadenced tone progress status of a telephone call in any one of a plurality of telephone networks is disclosed. A set of parameters for each of a multiplicity of predetermined single and/or cadenced tones in which some call progress status having multiple different sets of parameters for the same call progress status are stored in memory. Parameters of the cadence (s) of a valid tone present on the telephone line are measured and compared with the multiplicity of sets of parameters stored in the memory to establish the presence of the call progress status represented by the corresponding cadenced valid tone. For tones having multiple cadences, the measured parameters of each cadence is compared with a corresponding set of cadence parameters of the memory to establish the presence of the call progress status represented by the multiple cadenced tone.
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Family
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Cited Art Landscape
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