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from the Plum Voice IVR Glossary
Confidencelevel is a VXML property that specifies the speech recognition confidence level. The confidence level is a float value from 0.0 to 1.0. Results are rejected and a nomatch event is thrown when application confidence is below this threshold. A value of 0.0 means minimum confidence is needed for recognition, and a value of 1.0 means maximum confidence is needed. The value is a real number designation. The default value is 0.5. The Plum Voice platform has been finely tuned to minimize the number of false positives above 0.5, and as such, lowering this value is not recommended. For example, if a threshold of the confidence level is raised to 0.75, this will require a clear response of a “yes” or “no” answer. Using a high confidence level setting is useful when you are expecting a precise match to your grammar.
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