Certain industries, especially banking and telecom, face pernicious fraud in the contact center.  Voice Biometrics provides two modes of prevention and detection:  

In this article http://www.growthbusiness.co.uk/growing-a-business/technology-for-business/2539596/can-you-trust-biometrics.thtml#comments, Matt Peachey of Pindrop is quoted as describing how fraudsters are using techniques like barking dogs and police sirens in the background to create so much noise that an Active Voice Biometric authentication over the phone will fail, forcing the call to go to an agent where only Knowledge-Based Authentication is the security barrier.