An automated system is calling our company’s toll-free line every 20 minutes. It’s racking up long distance charges with each call and our SIP provider says that there is nothing that they can do to stop it. Each call comes in with a spoofed caller ID so blocking each number would be a futile effort. The calls are not coming in on an IP address, so we can’t block that either.
How can we see the caller’s real phone number? If it’s not possible to see the callers real caller ID number couldn’t someone from China call a toll-free number in the US that is supposed to only accept inbound domestic calls? If so, what the hell kind of system is that?