Most businesses are familiar with denial-of-service (DoS) attacks, or attacks that cripple an IT network, system, or machine to deny access to intended users. Not many businesses know, however, that Voice over Internet Protocol (VoIP) systems can be a DoS attack target too. If you have security measures in place against regular DoS attacks but don’t have one for your telephony system, it’s about time you fix that.

Denial-of-service attacks

The end goal of any DoS attack is to overwhelm a system with so many requests that it is eventually forced to shut down. Telephony DoS (TDoS) attack is a subcategory leveled at VoIP systems. Alarmingly, this attack is commonly used against hospitals and 911 phone lines. Some TDoS attackers even demand a ransom to halt the attack, which is similar to ransomware attacks. They take advantage of cryptocurrencies and caller-ID spoofing to make it incredibly difficult to identify attackers.

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

What organizations need to do

While your first instinct may be to lock down your VoIP system with complicated security measures, doing so will only do more harm than good. Most businesses can’t operate if they can’t communicate with their customers, business partners, and other third parties.

Although VoIP may be a digital resource similar to other components within your IT systems, the very nature of phone lines makes hiding them behind firewalls and other protections impossible. Fortunately, there are now new security protocols that 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. Get in touch with our team to learn more about these protocols.

If you’re experiencing any abnormalities with your VoIP system, or if you want to deploy the most advanced solution that the market has to offer, our expert team of IT professionals is ready to help you at the drop of a hat — just call today.

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Theft of service is the most common type of fraud that impacts Voice over Internet Protocol (VoIP) phone systems. Let’s take a closer look at how it affects VoIP networks and how your organization can prevent or minimize the risk of this type of fraud.

What is theft of service?

VoIP theft of service is the most common type of VoIP fraud. At its most basic level, it involves the theft of your organization’s VoIP account credentials, including usernames and passwords, either by eavesdropping or by introducing malware into your system. Once cybercriminals gain access to your account, they can freely make phone calls or change your call plans, running up your VoIP bill.

In addition, cybercriminals may use the stolen data to carry out other fraudulent activities. They can also use theft of service to flood your VoIP network with promotional calls similar to junk email via an attack called spam over internet telephony, or SPIT. Once they infiltrate your communications network, they might broadcast unsolicited messages or advertisements over your VoIP system. This keeps users from making or receiving calls, which can have a significant impact on your business’s operations.

How can you avoid theft of service?

Preventing VoIP theft of service simply requires using a little common sense and implementing some technical preventive measures.

1. Make your passwords as secure as possible. Passwords must be 8–12 characters long, consisting of a combination of upper- and lowercase letters, numbers, and symbols. For added security, use passphrases, which are sentence-like strings of words. They’re usually longer than passwords, easier to remember, and more difficult to crack.
2. Install firmware patches for your VoIP phones and infrastructure regularly, and keep your antivirus software up to date.
3. Use fraudulent call routing detection and encryption software.
4. Set up an enterprise-grade virtual private network (VPN) for employees working from home. A VPN encrypts incoming and outgoing traffic without compromising call quality.
5. Review your organization’s call logs for any unusual trends or behavior, such as higher-than-usual call volumes or calls made during off-hours.

VoIP is an essential business communication tool, so it makes sense to understand what theft of service is to avoid its impacts on your company’s operations. For more information and useful tips on how to keep your VoIP system secure, drop us a line today.

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