The full switch off of both ISDN and PSTN will happen in 2025. It is important for business continuity that all Northern Ireland companies make the necessary changes before this date.
In 2015 BT announced that they would stop taking new orders for ISDN in 2020 and that the entire ISDN network would be deactivated by the year 2025.
Below we explain what these services are and what changes your business will need to make, and what preparations you may need to make.