9‑1‑1 is vulnerable to security issues, including call flood-based attacks such as TDoS, which saturate the network and prevent individuals from receiving timely service. 9‑1‑1 is vulnerable to TDoS, as a function being well known, having limited resources (especially call takers), older technology (in E9‑1‑1), and the need to answer every call. The NENA Telephony Denial of Service (TDoS) Information Document describes TDoS in 9‑1‑1 networks, including methods for detection and mitigation.
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National Emergency Number Association