PSTN / ISDN Switch Off FAQs

No – it’s a real national programme and milestone that will affect many thousands of businesses (and consumers) across the UK. BT’s page on the Switch Off is here. It will affect millions of lines and the services and devices which use the PSTN/ISDN for connection.

The PSTN (Public Switched Technology Network) is the traditional, copper wire based telephone network which has remained largely unchanged since the early days of public telephone networks. ISDN (Integrated Services Digital Network) is a digital platform that came into use in the 1980s to deliver not only voice, but video and other data too. 

This Switch off is a major change in the national infrastructure and as such requires the sort of planning and action that Brexit, GDPR and before it, Y2K necessitated.  

So, whilst there is the cost and disruption of changing, the upside is that the replacement should be cheaper, with access to a greater range of services and functionality.