Business Phone Systems after PSTN switch-off: comparing UCaaS, SIP Trunking and Hosted PBX
Openreach has set 31 January 2027 as the retirement date for the legacy Public Switched Telephone Network (PSTN), with BT’s ISDN switch-off following the same timetable. The deadline was extended from 2025, but Openreach’s July 2026 update confirmed there would be no further extension. For IT directors reviewing business phone systems, that does not automatically mean […]