THE PSTN/ISDN SWITCH OFF

THE PSTN/ISDN SWITCH OFF

In 2015, BT announced it will be switching off the PSTN and ISDN in 2025, marking the biggest change in the telecoms industry for over 30 years, but what does the end of PSTN and ISDN mean? What is ISDN and PSTN? The Public Switched Telephone Network (PSTN) is the...