I'm not going to say yes or no about this. But when I was looking for way to do this a year or so ago, I read on several spoofing web sites where it IS illegal in the US. I don't know anything other than what I read.
I would pay attention to this part in that article up there ^^^.
For example, if Caller ID spoofing is uses to deceive or defraud, by posing as a police officer or a bank, then separate crimes have already been committed. This bill would add an additional crime to existing charges where Caller ID spoofing is used.