machineDetectionSilenceTimeout

The number of milliseconds of initial silence after which an unknown AnsweredBy result will be returned. Default is 5000 milliseconds.
Increasing this value will result in waiting for a longer period of initial silence before returning an 'unknown' AMD result.
Decreasing this value will result in waiting for a shorter period of initial silence before returning an 'unknown' AMD result.
Check the Twilio docs for more info.
@default 5000