Brazil mandates call authentication and blocking of abusive spammers
The Brazilian federal government has published a provisional measure, establishing strict new regulations to combat telemarketing spam, fraud, and unauthenticated telephone calls. Under the new rules, telecommunication providers must implement an end-to-end authentication chain: originators must authenticate calls, transit operators must preserve them, and terminating providers must verify them before delivery. Unauthenticated calls must be blocked at termination, alongside calls and messages using irregula