ISDN/PSTN Switch-Off Explained

The Public Switched Telephone Network (ISDN/PSTN) is the UK’s traditional copper-based phone system. It has been in service for more than 40 years and supports landlines, old-style broadband, alarms and many business-critical systems.

The ISDN/PSTN is outdated, expensive to maintain, and cannot support modern digital services. The UK is transitioning to full fibre and VoIP technology, offering faster, more reliable communication.

Stop-Sell: No new ISDN/PSTN lines since 2023

Full Switch-Off: Scheduled for 2027

After this, all analogue services will cease to function.

All UK businesses using:

• Analogue or ISDN phone lines
• ADSL/FTTC broadband
• Lift and alarm lines
• Card payment terminals
• Legacy devices connected to copper lines

If you do nothing:

• Phones may stop working
• Alarms and lift lines may fail
• Payment machines may not connect
• Broadband may become unavailable

We help you:

1. Review your current lines
2. Identify what needs upgrading
3. Choose compliant alternatives
4. Complete your transition smoothly