> For the complete documentation index, see [llms.txt](https://docs.fusion.vectra.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fusion.vectra.ai/detection-models/library/denial-of-service/tp240_phone_home_reflection_ddos.md).

# tp240\_phone\_home\_reflection\_ddos

**Explanation**

This security event in the Netography Fusion Portal is designed to detect TP-240 reflection attacks. Voice-over-IP systems with TP-240 VoIP-processing interface cards can be used by attackers to amplify DDoS attacks. In a TP-240 reflection attack, the attacker sends UDP packets with spoofed source addresses to a vulnerable Voice-over-IP system, which will then respond with potentially thousands of reply packets.

**What to Look For**

When examining the results of the this security event, look for anomalous network traffic patterns involving UDP packets. Specifically, look for large amounts of traffic from a single source address, which may indicate a potential TP-240 reflection attack.

If a TP-240 reflection attack is detected, take immediate steps to block the malicious traffic. If hosts on your network are being used as reflection amplifiers, take action to deactivate vulnerable services, or block access to those systems from the internet.

**Related MITRE ATT\&CK Categories**

[Impact: Network Denial of Service, Technique T1498 - Enterprise](https://attack.mitre.org/techniques/T1498)

[Impact: Endpoint Denial of Service, Technique T1499 - Enterprise](https://attack.mitre.org/techniques/T1499)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.fusion.vectra.ai/detection-models/library/denial-of-service/tp240_phone_home_reflection_ddos.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.