12 August 2025 | Immervox

PSTN & ISDN Switch Off: What It Means for Small and Medium Businesses

The UK is on the brink of a major telecoms transformation. By January 2027, the Public Switched Telephone Network (PSTN) and Integrated Services Digital Network (ISDN) will be permanently shut down, marking the end of an era for traditional landline and early internet services.

Why the Change?

The move away from PSTN and ISDN is part of a wider digital upgrade across the UK. Key factors include:

Deteriorating infrastructure – copper lines are outdated and expensive to repair.
Limited capability – legacy systems can’t match the flexibility or speed of modern tools.
Demand for mobility – businesses now require high-speed, location-independent communications.

The replacement is an IP-Network, where voice and data travel over the internet rather than analogue lines.

What Comes Next?

Two technologies form the backbone of the new era:

VoIP (Voice over Internet Protocol) – Makes calls over an internet connection, offering lower costs, high-definition audio, advanced features, and the flexibility to work from anywhere. It integrates easily with CRM systems and cloud tools, making it ideal for SMEs.
FTTP (Fibre to the Premises) – Delivers fibre-optic broadband directly into your building for ultrafast, stable, and future-proof connectivity, essential for smooth VoIP and video conferencing.

Preparing for the Switch Off

With the deadline approaching:

Audit your current setup: check if phones, alarms, lift lines or payment systems still use PSTN or ISDN.
Plan your migration to VoIP and FTTP solutions.
Act early to avoid last-minute installation delays.

The 2027 switch off is the perfect opportunity for you to future-proof your business. Upgrading now ensures you stay connected, competitive, and ready for the digital future.

Other Press Releases from Immervox

03/12/2025 - Debunking the Most Common Ransomware Misconceptions Ransomware remains one of the most damaging and fast-evolving cyber threats facing organisations of every size. Despite its growing sophistication, many businesses still hold dangerous misconceptions about how ransomware works and how best to defend against it.

17/10/2025 - Why Upgrading to Windows 11 Is More Important Than Ever Microsoft has officially ended support for Windows 10 as of 14th October 2025 - bringing an end to vital security updates, bug fixes, and technical support.

23/9/2025 - In today’s digital age, remote and hybrid working have become essential to the way businesses operate With 81% of SMEs now adopting flexible working solutions. To keep teams connected and customers supported, having a reliable, scalable, and secure setup is no longer optional, it’s business critical.

21/7/2025 - Introducing Immervox Business Packages – Smart Solutions for Real Business Challenges At Immervox, we understand that navigating IT and telecoms can be challenging, especially when you know something isn’t working but aren't sure how to fix it.

02/7/2025 - Cyber Security Essentials Download In today’s increasingly digital world, no business is immune to cyber threats- not even industry giants like M&S. The recent cyber-attack on the iconic brand serves as an important reminder that cyber-criminals are constantly evolving, and no organisation is too big, or too secure, to be targeted.