This makes it sound like someone is actually hacking, or there is some (prospectively illegitimate) tool like this 'Asterisk' that allows you to do this. This is all false, its the responsibility of the PSTN carrier, I.e. nufone, vonage, voicepulse, etc to set and confirm the data. They leave it uncontrolled, trusting the call originator (now open to anyone with a credit card) to set and maintain it properly. Their trust is clearly misplaced, and it won't be long before its simply revoked and the control is back to the big boys.

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Link to this comment: http://www.securityfocus.com/comments/articles/9061/27364#27364