In their battle to keep fraudsters at bay, large banks are running their own versions of The Dating Game and evaluating strangers based on how they talk.

The banks are using new software or testing beta versions aimed at comparing callers' speech patterns to stored voice prints. In some cases, the vocal profiling is being used as a marketing tool to cut the number and duration of call center interactions, prevent customer defections and improve cross-selling. In others it's being employed to fight fraud by pinpointing callers' places of origin based on their accents in a bid to determine whether they're members of groups known for financial scams.

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