As you can see from my Title ... I am P!$$ed!
I have no solution but I wanted to share info
Those bastards are infuriating.
I've been working with a Senator here in my state for about a year now (he's a high school friend so he actually listens to me) on a suggested law to make it mandatory for Telco providers to implement a system for this.
I have no solution for you and if you aren't interested in how this works, no need to read further...
So what I have worked up with him is a mandatory filtering system.
Every telco knows what telephone numbers exist on their system. So let's use AT&T for this example. They know all the telephone numbers that they own for distribution. They used to be in blocks, but now since the world of porting came about, they are scattered and messy, but they still know. It's the same principle used in IP routing so all other carriers know where to send calls and how to get them routed there.
so let's say you are at AT&T customer. Now lets say some nigerian asshole uses skype and calls you, spoofing his callerid. When the call comes inbound to the AT&T network, they will be forced to check that callerid. If it's one of theirs, they drop the link and your phone never rings because they will know it's spoofed. All the carriers in the US would eventually need to follow this standard in order for it to work 100%. In doing so, those calls could never be routed to their destination.
Now, if the nigerian asshole is in the USA, AND is also on AT&T like you AND he tries to call you with a spoofed number, AT&T will automatically already KNOW he's spoofing a number that is not his and drop the call. So all the bases are covered.
The real issue is the carriers. They don't want the calls blocked. They are making money when your phone rings. So getting them to voluntarily do something about it isn't so promising. Just like USPS gets paid for delivering junk mail, the phone carriers make money off of those calls.
I don't know if this little project we are doing will ever go anywhere, but we are going to try. The sons of bitches have nearly rendered my home phone useless. 95% of all calls I get are from these bastards. Of course I block all calls with no callerid.. something you appear to be having an issue with.
I'm pissed off and I'm on a mission.