# Advanced Methods To Target and Eliminate Unlawful Robocalls
> **Federal Communications Commission** · Final rule. · Published 2025-03-24 · Effective 2026-03-25 · 90 FR 13416
## Document
- **Document number:** 2025-04811
- **Category:** robocall-tcpa
- **Federal Register citation:** 90 FR 13416
- **CFR reference:** 47 CFR 64
- **Publication date:** 2025-03-24
- **Effective date:** 2026-03-25
- **FCC docket:** CG Docket No. 17-59
## Abstract

In this document, the Federal Communications Commission (Commission) modifies its existing call blocking rules. Specifically, the Commission requires all domestic voice service providers to block based on a reasonable do-not-originate (DNO) list. Second, it requires voice service providers to return Session Initiation Protocol (SIP) code 603+ when calls are blocked based on reasonable analytics.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/03/24/2025-04811/advanced-methods-to-target-and-eliminate-unlawful-robocalls)
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