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Another one is http://www.maxmind.com/app/telephone_overview

This is a classy company, very reliable. We've been using them successfully for years for fraud prevention in online credit card charging.

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How does phone verification work with customers who are deaf? Does the API could provide an option where the computer calling the customer plays Baudot code [http://en.wikipedia.org/wiki/Baudot_code] instead of speaking the numbers in English?

Text messages could work in that case, no?

Here. here. We use MaxMind.com for their GeoIP product too

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