# Brazilian telecom anti-spam regulation dispute > Live situation record from CLSTR: https://clstr.news/situations/brazilian-telecom-anti-spam-regulation-dispute > Updated: 2026-08-31T21:29:05.000Z. Sources: 17. Developments: 4. A dispute emerged in Brazil following the implementation of an anti-spam tool by telecom operator Vivo. The system, designed to block robocalls and spoofed numbers by analyzing caller behavior and authentication, faced complaints from at least seven other telecommunications providers. These operators filed complaints with the national regulator, Anatel, alleging that the filter was overreaching and blocking legitimate calls from essential services such as hospitals, municipal offices, and public-service hotlines. In response, Anatel established new standardized rules for telecommunications operators through Decisory Dispatch No. 82/2026. The new regulations make anti-spam tools optional but require that any operator using them must follow principles of transparency, proportionality, and non-discrimination. The rules mandate that these services be free of charge and allow users to opt-out within 24 hours. To prevent the issues raised during the initial dispute, the new guidelines explicitly prohibit the blocking of calls from emergency and essential services, including police, health services, civil defense, and fire departments. While operators may use criteria like call volume and duration to identify abuse, call volume alone cannot be the sole basis for blocking. Furthermore, calls from authenticated fixed numbers via the ‘Verified Origin’ system cannot be repelled. Recent developments clarify that these tools must be enabled by default and provided free of charge to all customers. Operators are now required to establish communication channels for users to contest blocked numbers, with a mandatory response time of up to 10 business days. Additionally, companies implementing these mechanisms must notify Anatel within seven days, providing detailed descriptions of their systems, criteria, and contestation procedures. While operators may choose their own technology to identify and treat calls, the regulatory framework aims to combat telemarketing, debt collection, and fraud while protecting legitimate communications. ## Claims - Anatel established new rules for anti-spam systems provided by telecommunications operators. (corroborated by 3 sources) - Anti-spam tools must be provided free of charge and activated by default for all customers. (corroborated by 3 sources) - Operators are prohibited from blocking numbers used by essential services, including health, security, civil defense, and fire departments. (corroborated by 3 sources) - Operators must provide channels for users to contest blocked numbers and respond to requests within 10 days. (corroborated by 3 sources) - At least seven companies filed complaints alleging that anti-spam tools, specifically Vivo's system, blocked thousands of legitimate calls. (corroborated by 3 sources) - Blocking decisions must be based on technical metrics such as call volume and duration. (corroborated by 3 sources) ## Timeline ### 2026-08-31: Anatel establishes new rules for blocking abusive telecom calls Anatel has introduced new regulations requiring Brazilian telecom operators to provide free, automatic anti-spam call blocking tools for consumers, with easy opt-out options. 7 sources. https://clstr.news/cluster/anatel-establishes-new-rules-for-blocking-abusive-telecom-calls ### 2026-08-28: Anatel establishes new anti-spam rules for Brazilian telecom operators Anatel has issued new rules for Brazilian telecom operators to standardize anti-spam systems, ensuring they are free, default-on, and do not block essential services like hospitals or emergency responders. 6 sources. https://clstr.news/cluster/anatel-establishes-new-anti-spam-rules-for-brazilian-telecom-operators ### 2026-08-17: Anatel establishes new anti-spam rules for Brazilian operators Brazil's Anatel has issued new standardized rules for telecommunications operators to implement anti-spam systems to block unwanted calls while protecting essential emergency services. 5 sources. https://clstr.news/cluster/anatel-establishes-new-anti-spam-rules-for-brazilian-operators ### 2026-08-04: Vivo anti‑spam system triggers telecom dispute in Brazil Vivo’s anti‑spam filter, meant to block robocalls, is being challenged by several Brazilian operators who say it also blocks legitimate calls from hospitals and public services; Anatel is reviewing the criteria 8 sources. https://clstr.news/cluster/brazils-anatel-reviews-vivo-antispam-system-after-operators-report-blocked-legitimate-calls --- Cite as: Brazilian telecom anti-spam regulation dispute. CLSTR, https://clstr.news/situations/brazilian-telecom-anti-spam-regulation-dispute