BT Openreach has announced* it intends to switch off the traditional, copper-based telephone network in 2025. This is commonly referred to as the PSTN Switch Off. While 2025 may seem a while away, from December 2023 you won’t be able to purchase any new ISDN or PSTN-based services, with many locations affected by a stop sell much sooner than that. This is a major step towards the United Kingdom’s mass IP-network migration, with VoIP core networks set to replace all the legacy PSTN services in just a few years’ time.