Darren: Intersting idea. My worry is that anything that is at the caller's end of the conversation is suspect...if I am a scammer, then I wouldn't be too phased by having to set up something that sounds like a Voice Biometrics engine. The same problem applies, I think, to anything where you depend on the customer calling back...if you've given them the number, extension, name, that you then suggest they call, how do they know it is genuine rather than just an accomplice/extension of the scammers? The authentication process has to be something that the customer has control of and that they operate. I think the only other route to go with this is a "public verification process", whereby, for instance, the voice biometrics engine was controlled by a public body equivalent to, say, a real-time Criminal Records Bureau. Organisatioins would register their agents, their voice prints and their contact details with the "Public Verification Authority", and customers would then route their callbacks through the PVA... But this seems like a massive sledgehammer to crack a relatively small nut; and it also introduces a two-step process, which is likely to add expense and significant drop out during the callback process. I think we need to explore simpler, non-technological options first...but I'm still trying to find somebody who has done anything systematic about this problem, and what their experience has been.
Guy Fielding
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