BT are switching off the PSTN and ISDN networks for good, starting with a cease of new supply by 2020 and moving to a full migration to IP before 2025. The BT ISDN switch off could affect thousands of businesses in the near future, especially those unaware of BT’s phasing out of ISDN technology.
If you work within the industry, the switch to IP technology makes perfect sense. Traditional phone lines are a legacy technology with high maintenance costs and alot of drawbacks. ISDN was originally designed to allow both voice and data services to be delivered simultaneously however, just as we have moved on from the limited functionality of brick sized mobile phones, the introduction of high speed internet access means ISDN technology is no longer relevant in the average work place.