The PSTN switch-off is the process of shutting down the Public Switched Telephone Network (PSTN), which is the traditional copper-based telephone network. The PSTN is being replaced by a new digital network called Voice over Internet Protocol (VoIP). The PSTN switch-off is scheduled to take place in the UK in December 2025. This means that businesses that currently use PSTN-based services, such as landlines and ISDN lines, will need to switch to a new digital solution by that date.

Which steps do you need to take to prepare for the Switch off?

  1. Check your connectivity

Most of the modern business communication tools rely on the internet connection. To be able to use cloud services such as digital voice, chat and video meetings, you need powerful connectivity to handle increasing usage.

  1. Analyse your current communication system

The surveying of your current telecommunications can help to understand how much your business depends on PSTN lines, how many ISDN lines are in use at the moment, any future equipment requirements and any other relevant services in use.

  1. Choose your option to switch

After you survey your current system and understand a company’s requirements, it’s time to choose a new system. There are a lot of different options to choose from, depending on your business requirements. You can speak to your current telephony provider and get advise on which solution is the best fit for you.

  1. Plan your migration

To prevent any disruption of the business processes, the best practice is to create a migration plan. Set the timeline for the project, assign tasks to team members, and make sure everyone is aware of the process.

  1. Make a test and review your new solution

When the new system is in place, make sure you do a few tests before ISDN switch off to ensure everything works correctly and if there are any doubts, there is still time to fix the problem.

Does your communications system still relies on ISDN lines?

Contact us today via email at or call 0345 812 3800 to find out more about how Touch Blue can help you choose your new telephone system hassle-free.