The UK’s Public Switched Telephone Network (PSTN) and Integrated Services Digital Network (ISDN) will be switched off by December 2026, marking a significant shift in business communication. As these legacy systems are phased out, businesses must transition to Voice over Internet Protocol (VoIP) to stay connected.
This blog covers everything your business needs to know about the VoIP changeover, including what’s happening, how it will affect your operations, and what steps you need to take.
What is the UK VoIP changeover?
BT Openreach is shutting down PSTN and ISDN services, meaning traditional landline systems will no longer work. Instead, businesses must switch to VoIP, which transmits calls over the internet rather than old copper phone lines.
This change is part of the UK’s digital transformation to provide faster, more reliable, and future-proof communication solutions.
How does this affect your business?
- Landline phone systems will stop working – If your business still uses ISDN or PSTN lines, they must be replaced with VoIP.
- Broadband-dependent services need upgrading – Equipment such as security alarms, card payment terminals, fax machines, and door entry systems connected to PSTN will need VoIP-compatible alternatives.
- Faster and more flexible communication – VoIP enables advanced features like video calls, mobile connectivity, call forwarding, and cloud integration, making business communications more efficient.
- Cost savings and scalability – VoIP is often cheaper than traditional phone lines, especially for international calls, and scales easily as your business grows.
What should businesses do now?
Check your existing phone system
- Audit all phone lines, fax machines, and devices connected to PSTN/ISDN.
- Contact your telecommunications provider to confirm if you’re affected.
Upgrade to VoIP
- Choose a reliable VoIP provider such as Enercomm to replace your landline.
- Consider hosted VoIP solutions for cloud-based business communication.
Ensure a strong internet connection
- VoIP requires a stable broadband connection. If necessary, upgrade to fibre broadband for seamless calls.
Update other business systems
- Upgrade alarm systems, payment terminals, and other devices to be compatible with VoIP.
Train your team
- Educate employees on new VoIP systems and ensure they can use its features effectively.
Why businesses should act now
The PSTN and ISDN switch-off is already in progress, and delaying the transition could result in service disruptions and business downtime. Numerous providers have ceased offering new ISDN lines, so transitioning early guarantees a smooth migration without the stress of last-minute arrangements.
Future-proof your business with VoIP
VoIP isn’t just a replacement for landlines — it’s a better, smarter way to communicate. With benefits like lower costs, increased flexibility, and integration with business tools, VoIP is the future of business communication.
Need help making the switch? Speak to Eazycomm for expert advice on upgrading to VoIP.