Hardly any phone call system in a business beats VoIP when it comes to efficiency and flexibility. However, it’s not immune to cyberattacks. Discover how you can secure your VoIP ASAP.

What kind of communication system are you using for your business?

Many businesses utilize Voice over Internet Protocol (VoIP). This technology allows employees to make and receive voice calls using only their internet connection. As your local IT provider in Knoxville, TN, we have some information for you.

VoIP is often a wise choice, bringing several benefits to a business. Among its benefits include lower operating costs, greater convenience, increased accessibility, better scalability, and the ability to multitask. VoIP also comes with advanced features for teams of all sizes, is completely portable, and offers superior voice quality. However, VoIP systems also have limitations, with cyberattacks being their number one downside. The good news is that it is possible to protect a business’s VoIP system from hackers. And if you have VoIP implemented in your business, it’s not too late to secure it. Read on to discover how the most common threats attack your network and our tips on preventing them.


All VoIP systems require a stable internet connection to function properly. Unfortunately, their reliability on the internet makes them vulnerable to various security issues. Among these threats are:


Denial of Service (DoS), a common threat to VoIP systems, means attacks designed to shut down a machine or network and make them unusable. When this happens, legitimate users of VoIP technology may not be able to access their information systems and devices. Call centers can be affected by lower call quality, uptime, and latency.


War dialing is an attack that controls the company’s private branch exchange (PBX) and scans for other phone networks. This means hackers can dial numbers and connect to modems and other extensions.


Toll fraud is a threat that consists of making calls to outside lines from a company’s existing system. For example, hackers will dial costly international numbers intending to rack up toll charges to your business.


This is a common threat wherein attackers send fraudulent messages designed to trick victims into revealing sensitive information. Often, the unsuspecting victims would divulge information about passwords, internal IP networks, and similar data.


It’s a threat where attackers install malicious software via email or phone. A file or code gets delivered over a network and has the goal of infecting, stealing, or exploring the information contained within a system. After infecting the system with malware, VoIP hackers can enter your network and access critical business information


The call interception attacker uses unsecured networks to intercept the Session Initiation Protocol (SIP) traffic that serves to initiate, maintain, and terminate real-time voice and video sessions. A victim of a call interception attack can be redirected to another line hosted by the hacker, for example.


Given the variety of threats imposed by attackers on VoIP systems, it’s necessary to optimize your VoIP security ASAP.


Secure firewalls are necessary for all VoIP systems. It’s important for your VoIP software and hardware firewalls scan information that goes in and out of the system and ensure it is secure. If spam or a threat comes your way, the firewall will identify and gain control over it, shielding your system shielded from the attack. Also, a good firewall will allow the data packets you send to travel unhindered.


Your VoIP system is no different from any other software or platform you use for handling sensitive information. For this reason, it needs to be protected with strong and regularly updated passwords. Aim for combinations of at least 12 characters, including numbers, upper- and lower-case letters, and special symbols. And for ultimate protection, go for passwords consisting of a random character series. It’s crucial to set a password as soon as you configure your VoIP system. Otherwise, you’re likely to forget about it later. Also, remember that some VoIP phones come with pre-set passwords, often available publicly. That’s why you should change yours as soon as you get a chance. Ideally, try to change your passwords every three months.


Many VoIP attacks happen due to toll fraud. So, if your business runs locally, there’s no need to have the international call option enabled. This allows you to be on the safe side and avoid paying expensive bills you weren’t even responsible for making. You can let your VoIP service block 1-900 numbers to avoid toll fraud.


Many of the VoIP attacks arrive due to irresponsible behavior. To prevent this from happening, educate your team on how they can best do their job without affecting the system’s security. For starters, they should know how to spot unusual network activity, handle passwords, and report suspicious behavior. They should also report ghost calls and missing voicemails whenever received. Staff also shouldn’t store voicemail for too long. The reality is that, sometimes, cybersecurity training during onboarding isn’t enough. That’s why you should do periodic refresher training.


Ideally, you should deactivate the web interface used for your VoIP system. Why? Using phones on a desktop computer opens an area of weakness to attackers. It’s enough for a single phone user falling prey to leave the whole system exposed to an external party. All your data can be stolen in text format as a result. If it is absolutely necessary for you to use the web interface, be sure to secure it very strictly.


Virtual Private Networks (VPNs) are great software that encrypts traffic regardless of your employee’s location. You can set up such a network for your remote staff to prevent data leaks and breaches. The good news is that using this service won’t degrade the call quality.


VoIP systems are a fantastic alternative to landlines. After all, they offer many more features and flexibility at a fraction of the cost. However, their reliability on the internet also makes them susceptible to cyberattacks. If you have just set up a VoIP system for your company or are thinking of starting one, securing it should be your number one priority. Don’t risk falling prey to toll fraud, malware, phishing, and other attacks. Take some time to secure your business by following the tips from this article.

And if you need more help to implement these changes or would like to further discuss securing your business’s VoIP system, reach out to us and we can set up a 10-15-minute chat at 865-273-1960.



Article used with permission from The Technology Press.