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this looks pretty much like it http://www.phoneconfirm.com/

Thanks for the link. I think there is room to improve on the pricing. I wonder if there are other outfits that do this.

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.

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

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?

Maybe, but on the other hand it would be painful if many sites would start using phone verification.

Good idea. And integrate is as a hosted/managed service similar to discuss.