The BIG BT SWITCH OFF and what it means for your business

The UK’s telecoms networks will undergo massive changes in the next three years, with BT shutting off its traditional phone lines in favour of internet-based systems.

In November 2017 BT announced it would not provide ISDN and PSTN services in the UK past December 2025 and would be moving all its business customers to SIP (Session Initiation Protocol) and VoIP (Voice over Internet Protocol) solutions. And, as a pre-cursor to this switch off, from September 2023 there will be a Stop Sell order, with BT no longer selling or upgrading ISDN or PSTN.

As of December 2025, all ISDN and PSTN services will cease to operate.