At the carrier level, number spoofing doesn't mask where the call originated from. It's simply a mechanism for a caller to convey to the receiver who is calling

At the carrier level, number spoofing doesn't mask where the call originated from. It's simply a mechanism for a caller to convey to the receiver who is calling. It's allowed to be spoofed to enable legitimate things like all call center lines to report as the same 1800 number of a business. The problem is that it's been on the honor system. With stir/shaken it's a matter of proving identity. Carriers are required by law to connect calls, it's a monopoly thing to prevent an AT&T from refusing to connect competitor's calls to damage their business. The FCC hasn't just given them permission to not connect calls, it has ordered them to cease connecting those calls.