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CallerID spoofing  |  (2005/05/25 11:45)

This is old news, but I've run into a few people lately who still weren't aware, so I dug up some fresh links. The basic gist is that spoofing caller id is easy and so any authentication system that relies on valid CID info is broken.
RootSecure.net covers CallerID spoofing w/ Linux and Asterix.
There are also a few services that make things trivial.
SpoofTel
CamoPhone
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