How to prevent Telephony Denial of Service (TDoS) attacks
We’ve noticed an uptick in inquiries about solutions to prevent TDoS (Telephony Denial of Service) attacks. Such attacks are bad news: they can target and overwhelm critical telephone systems, such as emergency response numbers or call centers. The good news: effective solutions are available.
TDoS attack profiles
There are different versions of TDoS attacks. They share a common feature in generating many calls to a destination, which eventually overwhelms the PBx or trunk. They vary in how these calls are generated.
In a centralized TDoS attack, computer software is used to generate many calls from one source.
With a distributed TDoS attack, malware is distributed to many call sources to programmatically generate lots of calls at the same time.
With either profile, attacks can be prevented by analyzing call traffic. When the volume of traffic breaches a threshold, further calls are blocked or diverted, ending the attack.
In a centralized attack, the fraud prevention software scores telephone calls with common attributes, such as calling and called numbers, users and groups. When the cumulative score for a commmon grouping breaches a threshold, further calls are blocked or diverted to IVR for a period of time. The attack is ended.
With a distributed attack, fraud prevention software scores call traffic to a destination. When the cumulative score of calls to a given number crosses a threshold, further calls to that destination are diverted to an Interactive Voice Response (IVR) system for screening. The IVR prompts the caller for a response, which the distributed malware cannot provide. The attack is over.
TransNexus TDoS prevention solutions
- SIP Analytics analyzes call traffic for detection of TDoS attacks, fraud attacks and unwanted robocalls. Once detected, calls can be blocked or diverted.
- CAPTCHA gateway is an IVR system that accepts diverted calls and prompts for human interaction.
We offer these services on-premises or in the cloud, providing scalability to defeat any TDoS attack.
Contact us today for more information on TDoS prevention.
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