Denial of service attacks on VoIP systems

Posted on Monday October 24, 2016

When most of us think of cyberattacks, we think of viruses, trojans, and ransomware. Unfortunately, those aren't the only types of attacks you need to be on the lookout for. Companies that utilize Voice over Internet Protocol (VoIP) systems are also vulnerable to another type of attack. One of the biggest threats to these systems is denial of service (DoS) attacks, and if you have a VoIP system it's imperative you learn more about it here.

Denial of service attacks

The end goal of any DoS attack is to overwhelm a system with so many requests that the system is eventually forced to shut down. Telephony DoS (TDoS) attacks are a subcategory wherein these types of attacks are leveled at VoIP systems. Sadly, this security bulletin has jumped to the front of security concerns as a result of its use against hospitals and 9-1-1 phone lines.

In another depressing development, some TDoS attackers demand a ransom to halt the attack. Much like ransomware, with the help of cryptocurrencies and caller-ID spoofing, it's incredibly difficult to identify attackers.

TDoS attacks generally employ fewer resources than the DoS attacks that are designed to cripple IT systems such as networks, servers, and software. At its most basic, all that a TDoS attack requires is an automated phone dialer that calls a target phone number and hangs up -- over and over. That very simple concept can stop anyone else from getting through the line.

What organizations need to do

Counterintuitive as it might sound, locking down your VoIP system with complicated and unnecessary security measures will ultimately do more harm than good. Most businesses can't operate if they can't communicate with their customers.

Although VoIP may be a digital resource similar to your other IT systems, the very nature of phone lines makes it impossible to hide them behind firewalls and other protections. However, there are new solutions that offer protection to VoIP systems. The new security protocols can protect your communication infrastructure against those who try to use force to gain access to your directory information. These protocols can also identify, reroute, and filter calls coming from known attackers.

If you're experiencing any abnormalities with your VoIP system, or if you want to deploy the most up to date solution that the market has to offer, we have just the company in mind. With years of experience in the field, our expert staff is ready to help you at the drop of a hat -- just call today.