Understanding the 2027 PSTN and ISDN Switch-Off?
In January 2027, the UK will undergo a major overhaul of its communications. BT will officially switch off the Public Switched Telephone Network (PSTN) and Integrated Services Digital Network (ISDN), ending decades of reliance on analogue infrastructure. This monumental change, known as the 2027 Switch Off, will require all UK businesses to adopt VoIP (Voice over Internet Protocol) and cloud-based communication systems and begin using mobile and internet communications.
VoIP for Liverpool and Merseyside Businesses
If your business still uses a traditional analogue landline or ISDN systems, now is the time to act. At Tech IP, with an office in Liverpool, we’re helping companies across Merseyside make the switch, by offering VoIP for business UK solutions.
Many businesses based in Liverpool and the surrounding areas still rely on old legacy phone systems. Whether you are in a city-centre office, operate from an industrial park or a local retailer, now is the time to switch over to cloud-based phone systems.
At Tech IP, we provide local expertise with national reach, ensuring that Liverpool businesses are not only compliant with upcoming changes but also positioned to benefit from modern, cloud-based communication technologies.
Why Is the PSTN and ISDN Switch-Off Happening in the UK?
This change is part of the UK’s digital strategy to modernise its infrastructure. The ageing copper-wire networks that power PSTN and ISDN services are not only expensive to maintain, but increasingly incompatible with the demands of today’s businesses. According to BT Business, these legacy networks will be completely shut down by January 2027. This move supports the transition to full-fibre broadband and next-generation telephony systems.
Openreach is driving the UK’s All-IP Programme, phasing out old networks in favour of faster, more reliable fibre and IP-based systems. New analogue telephone lines have not been installed in the UK for many years, and in September 2023, BT stopped selling traditional phone lines in all exchange areas. Meanwhile, Ofcom is ensuring consumers and businesses receive the guidance needed to navigate the change.
Which Business Services Will Be Affected by the Switch-Off?
It’s extremely important for business customers to review which devices they are using and determine whether they need replacing or upgrading for the following:
- Landline telephone systems
- Analogue phone lines
- ISDN phone lines
- Security or Alarm systems using analogue lines
- Fax machines or point-of-sale devices linked to analogue lines
- Lift or entry systems connected via PSTN
- ADSL broadband
… then your services will stop working after the 2027 switch-off unless you upgrade.
Businesses that fail to migrate could face serious operational downtime and communication breakdowns.
The ISDN phase-out isn’t just a technical update – it’s a call to action now.
Key Benefits of VoIP and Cloud Telephony for Business UK
Migrating to a modern (Voice over Internet Protocol) system isn’t just about compliance it comes with a wealth of advantages:
- Lower Costs – VoIP systems typically offer significantly lower rates for local, national, and international calls compared to traditional phone services.
- Reduced maintenance – no need for expensive on-site hardware.
- Increased Flexibility – Employees can make and receive calls from any location using an internet connection, ideal for remote and hybrid teams.
- Easy Scalability – VoIP systems grow with your business. Add lines, users, or features in minutes.
- Enhanced Features – Voicemail-to-email, auto-attendants, call recording, call analytics, and video conferencing come as standard.
- Improved Reliability – IP-based systems offer better call quality and uptime than outdated analogue lines.
