The UK’s PSTN shutdown is one of the biggest changes we’ve seen in business communications for decades. If your business still relies on traditional phone lines or older digital services, the change is something you really can’t afford to ignore. The PSTN and ISDN switch-off will have an impact on how calls are made and how your broadband is delivered.
What is the PSTN, and Why Is It Being Switched Off?
The Public Switched Telephone Network (PSTN) is the old copper-based network that has carried phone calls across the UK for decades. ISDN is a newer version of that same circuit-switched technology. It’s widely used by businesses for voice calls and other communications.
Both of these systems are being retired, mainly due to ageing infrastructure that’s become more costly to maintain and doesn’t suit the needs of modern communication. The UK telecoms industry is moving in a direction of fully digital, internet-based services that deliver voice over IP (or internet), rather than through copper lines.
What are the Key Dates of the PSTN Shutdown?
The move away from PSTN and ISDN is already happening. Since September 2023, telecoms providers have stopped selling new PSTN and ISDN services. The original deadline was in 2025, but this has been pushed back, and the final PSTN switch-off date has now been confirmed as 31 January 2027.
That might sound far off, but migration takes time. As the deadline gets closer, the availability of engineers and support is likely to tighten. That’s why we recommend planning early.
What the PSTN Shutdown Means for Your Business
When the PSTN and ISDN switch-off is complete, traditional landlines won’t work, and all business services will need to run over digital connections using broadband or fibre. This change obviously has a huge impact on your phone systems, but it’s also important to remember that many alarms, payment terminals, CCTV, and security systems also use PSTN or ISDN lines. These, too, may need upgrading.
How to prepare for the PSTN switch-off.
Start by reviewing all lines, phones, and connected devices to identify PSTN or ISDN dependencies. Create a migration plan covering voice, broadband, and any other systems that may become obsolete. Ensure your broadband supports digital voice, and test services early. It’s also important to familiarise your staff with new systems to avoid disruptions ahead of the PSTN shutdown deadline.
Looking for a Telecoms Partner to Help You Manage the PSTN Switch-Off?
If you’re not sure how the PSTN switch-off affects your business, or you want clear advice on how to prepare for the PSTN shutdown, our team at Happy Telecom is here to help. We pride ourselves on honest, transparent telecoms and treating your business as if it were our own.
We handle everything from business broadband and office phone systems to managed IT support and future-ready solutions. When you work with us, you get top-level telecommunications with personal attention and no surprises on your bill. Email us at sales@happytelecom.co.uk or give us a call on 0800 285 1533 to find out more.
FAQs
Will my business phone number change after the PSTN shutdown?
It’s unlikely you’ll have to change your business phone number. Most existing numbers can be retained when moving to digital voice services.
Do you need fibre broadband for digital voice?
Not always. However, a stable, reliable internet connection is essential for consistent, high-quality calls.
Can I migrate in stages rather than all at once?
Yes, businesses can choose a phased approach, which might reduce risk and disruption.