24. The system of claim 22 , wherein the calibration parameter specifies a maximum level of ambient noise to satisfy the calibration test.
22. The system of claim 17 , wherein the one or more campaign configuration parameters include a calibration parameter that indicates that a calibration test should be performed, and wherein the user device is further programmed to: configure the computer program instructions to perform a calibration test prior to presenting to the user the one or more utterances, wherein to perform the calibration test, the user device is further programmed to: determine a level of ambient noise; and determine whether the level of ambient noise satisfies the calibration test; and present to the user the one or more utterances to be uttered by the user responsive to a determination that the ambient level of audio satisfies the calibration test.