It is about time... I have been known as a hard ar.. at my company for screening the caller id coming from customer PBX's PRI's. Yes, I work for a telephone company and I decided years ago to do this because I believed it was a way to commit fraud. Also it is used by bill collectors to get around the customers not answering their phones.
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Link to this comment: http://www.securityfocus.com/comments/newsbriefs/171/826#826