In December 2025, the Public Switched Telephone Network (PSTN) – the traditional phone system that uses copper wires to connect calls – is being switched off by BT Openreach.
This means everyone, including businesses, currently using PSTN-based services will need to move to another service before then, to be able to make and receive calls.
Will it affect me?
If you’re using PSTN or ISDN technology, then yes, you’ll need to make the move to a Voice Over IP telephony solution. December 2025 may sound like it’s a while away, but about 2.4 million businesses in the UK will need to make this switch. You might need to purchase new hardware or a better Internet Connection, so it’s not advisable to leave it until the last minute!
What’s the alternative?
You’ll need to transition to a Voice Over Internet Protocol (VOIP) or Cloud Telephony solution, before PTSN is switched off in December 2025.
What is VOIP?
VOIP is a solution that transmits voice calls and data using an internet connection, rather than traditional copper phone lines. This means you don’t need a physical phone line to make calls, just an internet connection. It’s flexible, can be cost-effective and offers more features (such as call recording and video conferencing) than traditional PSTN-based telephony services.
What should I do now?
The good news is that this isn’t happening overnight, and you have time to make the transition. If you’re a projectfive customer and you would like to talk to your Account Manager about what this means for your business, please give our team a call on 01276 455466 and we’ll be happy to help.