How to stay secure with your business phone system
Confused about VoIP security? You’re not alone. Get clear, practical advice on keeping your business phone system protected from cyber threats.

The power of mobile connectivity
Cloud phone systems are the future of business telecommunications. As the ISDN switch-off approaches in 2027, traditional phone lines will soon be a thing of the past.
While many businesses have already made the transition to cloud-based phone systems, some remain hesitant to make the switch. Concerns around cybersecurity and cloud security are the primary reasons for this. However, it’s important for business leaders to recognise that without the switch, their communications could be significantly impacted.
In this blog, we’ll provide some practical business phone security tips to ease your concerns and ensure your communications are future proofed, without any hassle.
How secure is VoIP?
VoIP technology offers robust security for your business. When used internally, a VoIP phone system is just as secure as your traditional landline. Vulnerabilities typically arise when making calls outside your internal network. However, if your internal IT infrastructure is secure, hosted voice solutions are incredibly reliable.
VoIP security is enhanced through Session Initiation Protocol (SIP), which makes your phone system both advanced and secure. SIP is a signalling protocol that secures internet-based telephony, providing robust protection for your communications over VoIP.


How to strengthen your VoIP security
While VoIP security is already strong, there are additional steps you can take to further enhance your security:
- Encryption: Encrypting your data adds an extra layer of protection. Even if your data is intercepted, it would be nearly impossible for hackers to decrypt it.
- Network testing: Regularly test your network through assessments and simulations, to ensure your network is impenetrable.
- Using a VPN: A Virtual Private Network (VPN) provides an additional layer of security by creating a private network for transmitting data safely and securely, like an internal network.
It’s also best practice to implement strong passwords and enable multi-factor authentication for cloud security purposes.
What are the main cybersecurity threats to VoIP security?
Business phone security should always be a top priority, as it’s essential not only for daily operations but also for compliance. The main cybersecurity threats to VoIP security include:
Malware
Malware is a type of cyberattack that targets individuals rather than the VoIP system itself. It typically happens when someone opens an email on a device linked to your phone system. To reduce this risk, training your employees to spot potential threats is important.
Phishing scams
Phishing attacks also target individuals. Cybercriminals impersonate legitimate organisations, such as banks or tax authorities, in an attempt to steal confidential information. Employee education and awareness are key to protecting against these attacks.
Call tampering
Call tampering occurs when hackers attempt to disrupt live calls. This can result in poor call quality, delays, or even periods of silence while the hackers try to steal data. Fortunately, business phone security solutions often detect and mitigate these types of attempts.
Denial of Service (DoS) attacks
A DoS attack can disable your network or phone system, preventing users from accessing vital services. Installing the right firewalls and cybersecurity measures can help protect your system from these types of attacks.
Concerns over cloud security
While cloud technology is relatively new, it’s understandable that businesses have concerns about the security of hosted voice solutions. One of the main concerns is data security, with some organisations fearing a loss of control over their data or an inability to meet compliance standards.


Are cloud systems more vulnerable to data breaches?
Absolutely not! In fact, cloud services can offer better control over your data. As a user, you typically have admin rights that allow you to easily access and manage your data. VoIP providers often use military-grade encryption to protect and store your communication data, making
it especially secure.
- Real-time usage tracking – Monitor mobile data and call usage to stay in control of costs and prevent excessive spending.
- Spend caps & alerts – Set limits and receive notifications when employees approach or exceed their allowances, particularly for roaming and international data usage.
- Cost-saving recommendations – Your account manager can provide insights into employee usage patterns, such as identifying frequent travellers and recommending roaming bundles or alternative plans to minimise costs.
Does cloud security meet industry standards?
Yes, cloud phone systems meet the highest security and compliance standards across industries. This includes industries with strict regulations, such as banking and financial services. Cloud telephony services are designed to meet these demanding security and compliance regulations.
If you're looking for a VoIP provider that prioritises data security and compliance, reach out to Radius. We can help you find the best solution to keep your communications safe and compliant.


Cybersecurity and remote working
As remote work becomes more common, cybersecurity concerns have grown. With more employees working from home, there’s an increased need for strong security solutions, and VoIP plays a major role in this. A secure VoIP system ensures that business communications run smoothly, regardless of location.
Final thoughts
To keep your business secure while supporting remote work, you’ll need a tailored cybersecurity solution. A trusted provider, such as Radius, can help you select the best VoIP and security system to suit your needs, ensuring that your business stays connected and protected.
At Radius, we provide expert business phone security advice, ensuring that your communications remain safe and secure. With secure hosted voice systems and comprehensive cybersecurity solutions, we can help you future proof your business. Let’s connect and get started today.

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Frequently asked questions
Can’t find an answer to your question? Talk to the Radius customer support team on 0330 818 5000. We’re here to help you with any questions or concerns you may have.