Telephony Denial of Service (TDoS) attacks occur when a large volume of telephone calls overloads a communications network element—overwhelming call capacity and disrupting communications. Congestion may occur in any part of a communications network, from the telecommunications provider infrastructure to end-user equipment. Whether malicious (e.g., cyber attack) or accidental (e.g., malfunctioning equipment), TDoS events present a unique challenge for emergency communications centers (ECCs). The Department of Homeland Security Cybersecurity and Infrastructure Security Agency (DHS CISA) has developed information about TDoS attacks, mitigation techniques and reporting information.
TDoS information is available directly here.
