Using CAPTCHAs for Voice SPAM/SPIT Mitigation

Here is a discussion by Martyn Davies on the VoIPSA Blog, about using CAPTCHAs to distinguish Voice SPAM/SPIT from a legitimate call. Dan York and Jonathon Zar of Bluebox Podcast discussed it and I totally agree with them, in that CAPTCHAs may be useful, but if they interfere in any significant way with the users experience, then they are likely to be more annoying than the actual voice SPAM/SPIT. I would have to be getting a lot of SPAM before I would want to subject callers to a query like this.

Here are the direct links:

http://voipsa.org/blog/2007/07/04/now-ive-captchad-your-attention/

http://www.blueboxpodcast.com/2007/07/blue-box-62.html