The FBI has published a Private Industry Notification (PIN) to provide awareness regarding Telephony Denial of Service (TDoS) attacks, noting they can affect the availability and readiness of emergency call centers and undermine public trust in these services. The PIN further discusses the impacts these attacks can have on call centers and threat actors’ motives, which can include to advance political or social causes or to extort municipalities for financial gain. It also includes a list of recommended mitigation measures and encourages recipients to report suspicious or criminal activity to their local FBI field office or the FBI’s 24/7 CyberWatch (CyWatch) at (855)292-3937 or [email protected].