This threshold is determined by your operation’s or application’s needs in your scenarios. After the system generates a score internally from 1 to 100 for a call, you may to determine an acceptance scenarios for your business needs. For example, “high confidence” level is between 90 and 100 points and the user can be accepted with no hesitation but a “medium confidence” level (between 70 and 89 points) can trigger an additional security question for verification and for all users system scored 69 points and below will be rejected.

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