If you're the types of person who likes to make prank calls, the "Truth in Caller ID Act of 2010" bill that was immediately passed won't be something you'll like. Under said bill, it will become against the law to use some caller ID service to transmit misleading or inaccurate caller ID information, with intent to defraud and trick. And this change will affect any real time voice communications service, which includes VoIP.
That being said, you're still able to block your own outgoing caller ID information, and law enforcement isn't affected as well. This is surely good for security purposes, but persons will need to figure out one more way to play pranks on persons.
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