Horizon engineering teams are currently working towards a full resolution. A further update will be posted in due course.
In 2025, BT is due to switch off both ISDN and PSTN services as it moves towards an entirely IP-based model of voice communication.
What is the impact of this for your business and do you need to take any action before the ISDN switch-off takes place?
For more information, please visit our ISDN Switch Off page.