How to protect yourself from VoIP eavesdropping

How to protect yourself from VoIP eavesdropping

Voice over Internet Protocol (VoIP) has become the telecom tool for businesses. Since calls are transmitted via the internet, VoIP often costs less than traditional phone services, and its sophisticated call routing features enable employees to communicate anytime, anywhere, and from any device.

But VoIP is not without its risks. Hackers want to listen in on VoIP calls; and by intercepting voice calls to eavesdrop, they can use sensitive information they hear to profit from or blackmail your company. Luckily, there are some precautions you can take to prevent this from happening.

Use two connections

If possible, isolate your VoIP infrastructure from other networks. That way, any eavesdropper malware threatening your main network does not reach your communications system.

Set up gateway security

After separating your networks, set up a firewall for your VoIP network that can identify signs of attack. This will act as your first line of defense against eavesdroppers. Additionally, consider installing intrusion detection and prevention systems to monitor and filter unauthorized VoIP traffic.

Implement Session Border Controllers (SBCs)

SBCs serve as firewalls to your VoIP sessions. They monitor your VoIP network, allow authorized sessions to pass through, and block incoming threats to the communications environment. Once you have an SBC installed, don’t forget to update it as often as you would other security products.

Encrypt your calls

Another way to thwart eavesdroppers is by encrypting your communications. This way, if a hacker does manage to intercept your calls, it’ll be difficult for them to glean sensitive information. If you need to encrypt your VoIP network, consider the following methods:

  • Transport Layer Security (TLS) secures incoming and outgoing traffic between callers.
  • Secure Real-Time Transport Protocol (SRTP) encrypts data packets transmitted during calls.
  • Virtual Private Networks (VPNs) provide a secure, encrypted tunnel to transmit and receive data.

Avoid public hotspots

Free public hotspots like the ones you see in your local coffee shop are far from secure. In fact, hackers connected to the same network could monitor your internet activity and intercept sensitive information. The best way to get around this is to use your own 4G connection whenever you’re planning to use your company VoIP outside the office. However, if you have no other option but to connect to free WiFi, make sure the information you’re transmitting isn’t sensitive.

Secure your devices

Endpoint security is often the most neglected area when it comes to VoIP security. You can have the most high-end encryption and gateway security tools available, but if smartphones, tablets, or computers are not secured, hackers can install malware that allows them to listen in on your conversations.

Address this by making sure you’re running the latest endpoint protection software on all computers and phones. Then, implement identity and access management systems to prevent unauthorized users from infiltrating your VoIP network through company-owned devices.

Consult with a VoIP provider

Building a secure VoIP network that can stop eavesdroppers is definitely possible. But unless you’re a VoIP expert, you should enlist some help. Meet with a managed IT services provider and make sure they can augment your communication systems with firewalls, encryption systems, SBCs, and strong endpoint security.

If your business in Atlanta is looking for a managed IT services provider that can offer all the security services we’ve discussed, why not visit We take security seriously and that’s why we install only the best solutions that keep hackers from stealing your data.