The BT announcement that ISDN would be switched off by 2025 did not come as a complete shock for those who have been paying attention to the trends in tech and technological improvement. For many businesses, the focus now remains on how to improve the business going forward to make it ready for the new world order.


To understand ISDN (Integrated Services Digital Network), it is important to understand PSTN (Public Switched Telephone Network). PSTN refers to the original landline telephone network. This network relied on analogue voice communications, providing reliable voice calls and later becoming the main carrier for internet connectivity. ISDN then came along, enabling the digital transmission of voice, video, and other services at the same time, using the traditional PSTN network. The ISDN switch off ushers in the new era of Session Initiation Protocol (SIP). SIP uses VoIP (Voice over Internet Protocol) to enable voice and video calls on a global scale using the computer and mobile devices with an internet connection.

Future-proofing your business

If you are still a business that operates on ISDN, here are a few ways to future proof your operations.

Modernize communications:

Whether large or small, businesses need to modernize their communications to stay ahead of the game. One of the ways to do this is to adopt cloud telephony. Given the ISDN shutdown, businesses will benefit from cloud telephony’s advantages like reduced contract bills simplicity and ease of operations. Further, unlike the legacy systems, cloud telephony enables the use of one’s own devices to make calls.

Keep track of your contracts:

Find out when your contract is due for renewal, thus giving you an idea of when you can make a switch. Granted, automatic renewal sounds like the easy way out, especially considering that 2025 is still a good number of years away. It pays, however, to not risk being left behind. Further, early changes give you the chance to grow your business and bring in new users into your cloud system. This is easier than wasting time adding users onto legacy systems that will soon be obsolete.

Regardless of the size of your business, making a move towards the future is the best bet for your business, call our team today 0330 818 5000 to discuss your requirement.