Actually, it's illegal. You can't spoof numbers.
Just like telemarketing/collection agencies now must show a name, or number, or something on the caller ID. It's covered in the telemarketing laws that cover the "do not call list".
You CAN do it with VoIP surely. But if you do it on a mass scale, then it's illegal. While reporting them to the FCC, do not forget your local TRW, or whatever the other collection agencies are. They take that shit seriously, and will go after them themselves.
