Helpful links about Caller Id Spoofing info:
To amend the Communications Act of 1934 to prohibit manipulation of caller identification information, and for other purposes.
H.R. 251: Truth in Caller ID Act of 2007
Knowing how this all works opens the eyes as to why it’s so difficult to control!
How Caller ID actually works
Get Help at the GSA Federal Citizen Information Center Consumer’s Action Handbook
Consumer Action Handbook