PSTN End of Life

The UK’s traditional telephone network — the PSTN (Public Switched Telephone Network) — is being permanently switched off by 2027. If your business still relies on PSTN or ISDN lines, now is the time to prepare for the transition to modern, internet-based telephony.

What Is the PSTN Switch-Off?

BT Openreach has announced that by the end of 2027, all PSTN and ISDN services will be withdrawn. This means that older copper-based phone lines and services like traditional landlines, ISDN2 and ISDN30 will no longer be supported.

Businesses across the UK must migrate to IP-based technologies such as VoIP (Voice over Internet Protocol) and SIP trunks to continue operating effectively.

What Services Will Be Affected?

  • Traditional landline telephone systems
  • ISDN2 and ISDN30 phone lines
  • ADSL and FTTC broadband that relies on PSTN
  • Legacy alarm systems and fax machines
  • Older payment terminals and emergency call systems

What Are the Alternatives?

LCUK offers a full range of future-proof telecoms and connectivity solutions to help you move away from legacy systems:

  • Hosted Phone Systems: Cloud-based telephony that works anywhere
  • SIP Trunks: Modern replacement for ISDN with improved flexibility
  • FTTP & Leased Lines: High-speed, PSTN-free broadband solutions
  • VoIP-Compatible Devices: Upgrade your handsets and systems

Why Act Now?

Waiting until the deadline can lead to rushed decisions, limited availability, and potential downtime. By planning your migration now, you’ll avoid disruption, save money, and unlock the benefits of modern technology sooner.

LCUK Can Help You Transition

We provide a complete consultation and migration service — from assessing your current systems to delivering and supporting your upgraded solution. We’ll help you:

  • Audit your current telecoms setup
  • Choose the right VoIP or SIP-based solution
  • Install and configure new hardware or hosted systems
  • Provide training and support for your team
  • Ensure business continuity throughout the switch

Keep Your Numbers & Avoid Downtime

With our number porting and call routing services, you can retain your existing phone numbers and ensure a seamless transition to IP telephony with zero downtime.

Next Steps

If you're unsure whether your system is PSTN-dependent or ready for the switch-off, contact us for a free consultation. We’ll explain your options and help you prepare with confidence.

Contact LCUK today or request a quote to start planning your PSTN migration.