] Overdue debtors beware: You may not be able to rely on
] Caller ID to screen out those annoying bill collectors
] much longer. A California entrepreneur has a plan to
] bring the hacker technique of Caller ID spoofing to the
] business world, beginning with collection agencies and
] private investigators.
]
] Slated for launch this week, Star38.com would offer
] subscribers a simple Web interface to a Caller ID
] spoofing system that lets them appear to be calling from
] any number they choose. "It creates an extra avenue for
] them to have someone pick up the phone," says founder
] Jason Jepson.

This is a good thing in away..."Please hold on one minute while i verify your telephone...Hmmm, It appears that this telephone # does not belong to the company you claim to be from. I don't know who you are, so I can't answer any of your questions. I will report this call to the police."

US website offers Caller ID falsification service | The Register