PSTN is an old analogue telephone network that has been in use for decades but is increasingly becoming out of date with modern digital technologies. ISDN allows calls, videos and internet data to be transmitted over one PSTN line.

If your business is currently utilising PSTN or ISDN services, whether it be via phone lines, card payment or even security features, then you need to start planning how your business will migrate from PSTN to a digital service today. Below we have outlined the steps you need to take to ensure a seamless transition process.

2025 is the year when Openreach will switch off PSTN, however individual exchanges are already no longer taking new orders.