The UK’s old copper phone network (PSTN) is being made redundant. Due to advancements in internet-based technologies, the decision to phase out the traditional networks was made. The final shutdown is planned for January 2027, but waiting until then could be risky. Providers are urging homes and businesses to complete their move to all‑IP services by the end of December 2025 so there’s time to test, fix and avoid surprises.
What’s actually switching off?
The Public Switched Telephone Network (PSTN) and older ISDN services that run over copper are being retired. Voice calls and a lot of connected devices that used to rely on analogue lines will move to IP (internet protocol). While your phone numbers stay, the transport changes from analogue to digital.
Key dates
- Now–Dec 2025: Move services to IP and test everything (voice, alarms, card machines, lift lines).
- January 2027: Planned final shutdown of the legacy PSTN. Any remaining analogue‑only services will stop working.
What could be affected?
Beyond phones, lots of familiar kit still leans on copper lines. Check for any of the following:
- Voice & fax: Reception lines, fax numbers, conference phones.
- Connectivity add‑ons: DSL broadband that uses the same copper pair.
- Safety & security: Intruder alarms, fire panels, lone‑worker devices, CCTV dial‑out, door entry/intercom.
- Operational tech: Lift/emergency phones, payment terminals, telemetry, vending, EV chargers.
- Remote sites: Warehouses, pop‑ups, construction cabins and kiosks with legacy lines.
Monitored Alarm Systems
As the PSTN switch off approaches, we want to ensure that our customers have all the necessary information and services for a smooth transition.
If an alarm monitoring unit (the hardware which connects the alarm to monitoring station) uses PSTN it will become redundant and require a replacement prior to Jan 2027. While the primary monitoring path Radio will still work, if the alarm monitoring unit isn't upgraded the system will no longer be 'dual monitored', this could invalidate your insurance if dual path monitoring is a requirement.
For MES Systems' customers with monitored systems who rely on the PSTN network as a backup communication path, we will be able to install a new module. This will enable their intruder alarm system to be switched from using the PSTN line as the backup communication path. By upgrading your system, you can continue to enjoy reliable security and peace of mind.
If you need any further assistance, our team is here to help, we'll be glad to discuss your specific requirements and provide tailored solutions.
