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Is Your VoIP Traffic Secure?

Last updated: 10 May 2023

Voice over Internet Protocol (VoIP) has brought about a significant change in how businesses communicate. VoIP enables companies to communicate with colleagues and clients more efficiently and at lower costs. A typical VoIP system has many benefits, including flexible call routing, improved team collaboration, and better customer service.

However, VoIP systems are not without their security concerns. Many businesses are hesitant to adopt VoIP systems due to the risks and vulnerabilities associated with the technology. This blog will discuss the security risks associated with VoIP systems, their potential impact, and effective ways to secure VoIP traffic.

The Common Types of VoIP Attacks

Denial-of-Service (DoS) Attacks

Cyber-attacks, called DoS attacks, frequently target websites, servers, and networks. A DoS attack’s primary objective is to disrupt a system’s normal functioning by deluging it with traffic until it becomes unresponsive. DoS attacks in VoIP systems flood the network with excessive traffic that can lead to system crashes or unresponsiveness.

A DoS attack could be disastrous if an organization relies on a VoIP system for business-critical communication. It can halt all communication, leading to significant financial loss and reputational damage.

Toll Fraud

Toll fraud is another common type of attack that specifically targets VoIP systems. Toll fraud occurs when hackers gain unauthorized access to a VoIP network and use it to make long-distance and international calls, which are usually charged at a higher rate. The caller usually profits from the fraudulent calls, while the business owner receives inflated phone bills.

Toll fraud is prevalent among businesses using VoIP because these systems are often accessed via the Internet, allowing hackers to exploit weak security protocols. Organizations can prevent toll fraud by implementing strict access controls, limiting the number of devices connected to the VoIP network, and auditing their phone bills for irregularities.


Eavesdropping is secretly listening to a conversation between two people without their permission or knowledge. In VoIP, eavesdropping involves intercepting voice packets traveling through the network. Hackers intercept these packets to obtain sensitive information, such as passwords or account numbers.

Businesses can prevent eavesdropping by using robust encryption protocols and enforcing secure authentication measures, such as multi-factor authentication and VPNs.

Man-in-the-Middle (MitM) Attacks

A man-in-the-middle attack is where hackers intercept communication between two parties to steal or modify data without the parties’ knowledge. The hacker usually alters the communication without the parties realizing it, leading to potential critical consequences.

MitM attacks can target VoIP systems by exploiting weak security protocols, software bugs, or unsecured networks. Businesses can prevent MitM attacks by implementing robust authentication protocols, using encrypted connections, and regularly updating their software.

How to Secure Your VoIP Traffic

Businesses can secure their VoIP traffic by adopting best practices such as:

Strong Authentication and Encryption

Businesses should utilize strong passwords, multifactor authentication, and robust encryption protocols to prevent unauthorized access to their VoIP network. Encryption protocols guarantee that all communication between parties remains private and secure.

Network Segmentation

Network segmentation helps to keep sensitive data separate from less sensitive data, making data access more secure and controlled. Organizations can provide secure access to their employees by segmenting VoIP traffic into separate networks.

Regular Software Updates and Patching

Regular software updates and patching improve the security of a VoIP system by fixing known vulnerabilities. Outdated software can contain vulnerabilities that expose a business network to security threats. Regular software updates help organizations avoid security issues and minimize the risk of security breaches.

Limiting Access to Administrative Controls

Restricting access to administrative controls lowers the possibility of unauthorized users gaining entry into the network. Businesses can ensure that only authorized accounts can access the network by allowing employee access only for necessary functions.

Firewall Protection

Having a firewall to protect the VoIP network is crucial. Firewalls monitor and control the incoming and outgoing data packets and traffic and scan it for malicious activity. Businesses can reduce the risk of security breaches by enabling only legitimate traffic to flow within the network.

Training Employees on Safe VoIP Practices

The security of a company’s network is heavily reliant on the contribution of its employees. Businesses must train their employees to identify and report security breaches and encourage them to follow safe VoIP practices, such as regularly changing passwords, not clicking suspicious links, and using only secure networks.

The Importance of VoIP Security for Businesses

It cannot be stressed enough how crucial VoIP security is for a business. A security breach could lead to a loss of customer trust and ultimately result in losing the entire customer base. The aftermath of a VoIP security breach can include data theft, financial loss, and damage to reputation.

Security breaches can cause significant financial losses for small businesses, making them highly vulnerable to security threats. It is important not just for small businesses, but all businesses must invest in VoIP security measures to secure their network against threats.

Best Practices for Securing VoIP Traffic

The following best practices are essential for securing a business’s VoIP traffic:

Conducting Regular Security Assessments

Businesses should regularly assess their VoIP networks’ security and overall security posture to detect and correct any vulnerabilities or misconfigurations. Regular security assessments allow organizations to identify and address security issues before they cause significant harm.

Utilizing Strong Passwords and Multifactor Authentication

By using strong and unique passwords, organizations can reduce the risk of unauthorized access to their VoIP network. Multifactor authentication can also improve the security of a company’s network by requiring users to provide additional verification before accessing the network.

Limiting Devices Connected to the VoIP Network

Limiting devices connected to the VoIP network is recommended to reduce security risks. Businesses can prevent unauthorized access by allowing only authorized accounts to access the network, potentially reducing the risk of security breaches.

Disabling Unnecessary VoIP Features and Applications

Disabling unnecessary features and applications that come with a VoIP system is important. By disabling features that aren’t necessary, organizations can reduce their network’s attack surface and limit the potential risks that come with using VoIP.

Keeping a Backup of Critical Data

Businesses should regularly back up their critical data to protect against data loss in case of a security breach. By keeping a backup of critical data, organizations can quickly restore their network after an attack and reduce the risk of data loss.

VoIP technology is becoming increasingly popular among organizations. However, small businesses face a greater risk of being targeted by VoIP security threats. Security threats against VoIP systems can cause significant financial loss and reputational damage.

Therefore, businesses must implement appropriate security measures to protect against VoIP security threats. Remember, the most effective way to protect your VoIP system is by adopting a proactive approach to security.

If you are not yet using VoIP, remember it offers incredible benefits. By selecting a reliable provider, adopting best security practices, and properly configuring your network, you can leverage the full power of VoIP without worrying about security threats.

BlackPoint IT provides comprehensive VoIP solutions for businesses. We can assist you in identifying any weaknesses in your VoIP system, applying necessary security measures to protect it against harmful attacks, and continuously monitoring your network to ensure lasting security. With our help, you can enjoy the full power of VoIP without worrying about security threats. To learn how we can protect your business from security threats, contact us today.