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FCC forces carriers to start blocking “impossible” caller IDs—and own the blowback

As of May 2026: Industry example warning customers about configuration fallout from DNO blocking

The FCC's robocall fight just hit the part where the referees stop warning and start pulling players off the field. As of December 15, 2025, U.S. voice providers are required to block calls that claim to originate from numbers that should never place outbound calls.

Updated May 15