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BT ditches ISDN telephone networks after 100 years

IT Blog from Resolve, IT Experts in Sheffield BT ditches ISDN telephone networks after 100 years
It is finally goodbye to ISDN telephone networks, which means everyone needs to switch to newer IP networks called “SIP Trunks”. Ged explains all...

In June 2018, BT announced that they would be turning off their ISDN network in 2025. It sounds like a good while away, but that means from this year they will no longer be taking new orders for ISDN lines.

This is all well and good, you might think – but what is ISDN? ISDN stands for “Integrated Service Digital Network” and is the network infrastructure that evolved from the original telephone networks over 100 years ago. Consequently, it is old and expensive to maintain and has been surpassed with new technologies.

A large proportion of our voice calls are already travelling over newer IP networks called “SIP Trunks”. If you have upgraded your phone system recently you will have probably either moved to a hosted platform (where each individual desk phone or soft phone client connects with a SIP trunk back to a datacentre) or you may have a SIP trunk from your provider with a phone system on site.

If your phone system is still using ISDN then it should definitely be on your radar to start thinking about when you will upgrade. SIP has been around for many years and so there is every chance your existing phone system can support migrating from its current ISDN connection to a SIP connection. Due to the portability and flexibility of SIP trunks you will be able to keep the same phone numbers and the switch is relatively straight forward.

If you were thinking of taking this opportunity to refresh your phone system, we’d love to have a chat with you. We can provide leading edge cloud hosted phone systems using VOIP telephony, that don’t require any onsite systems or hardware, and can be accessed anywhere you can get an internet connection!

For more information, please complete the box below or call 0114 2994050.


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