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How are Audio Captchas created?

Is there a service provides the audio Catpchas that blind people complete when filling out a Captcha?

Is there a 3rd party service or do each provider make their own?

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closed as off topic by AndroidHustle, dhmholley, ChrisF, Benny Skogberg, dnbrv Oct 16 '12 at 13:55

Questions on User Experience Stack Exchange are expected to relate to user experience within the scope defined in the FAQ. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about closed questions here.
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