STIR/SHAKEN compliance requirements have evolved significantly heading into 2026, and MSPs, VoIP providers, and telecom resellers need to understand exactly where they stand. This guide breaks down FCC obligations by provider role, explains what changed with third-party signing rules effective September 2025, and covers the new annual Robocall Mitigation Database recertification deadline of March 1, 2026. Compliance is not one-size-fits-all — your specific role in the call path, your level of network control, and your certificate ownership all determine what you are actually required to do. Whether you originate calls, sit in the middle of the path, or resell voice services through a white-label platform, getting this wrong carries real operational and financial risk. Use this breakdown to audit your current setup and close any gaps before they become enforcement problems.