Our focus is on empowering your team to work efficiently from anywhere, boosting productivity and collaboration through customised IT Solutions.
Meet the Acora One Team
The Acora team is ready and waiting to help. We’d love to hear from you!
Follow Us
To view this video please enable JavaScript, and consider upgrading to a web browser that
Home News room ISDN & PSTN Switch Off
Acora is a UK based, award-winning IT services and technology company with over 25 years’ experience. We provide a range of IT support and Microsoft-centric business software and cloud solutions to help mid-market organisations modernise their IT so they can compete and win in the digital economy. More than 200 clients trust us to take responsibility for part, or all of their IT from solution design to support.
This is a quick 5 minute guide to the ISDN and PSTN switch off, updated for 2024.
Known as the ‘BT ISDN Switch Off’, this will be a huge shift in the way people make phone calls in the UK.
The official final switch off will happen in December 2025.
Just under 2 more years!
For business continuity, it is vital companies learn about it and make the necessary changes now.
So let’s take a look at what it is and what you need to do to prepare.
A Public Switched Telephone Network (PSTN) refers to a telecommunications network which allows subscribers at different sites to communicate by voice.
Introduced during the 1800s PSTN allows for information to be transmitted through a network of copper wires.
PSTN has been used by businesses as their primary method of transmitting phone calls and fax transmissions for several years.
ISDN stands for Integrated Services Digital Network.
It’s a group of communication standards that use digital transmission to make phone calls, video calls, transmit data and other network services over the circuits of the traditional PSTN (Public Switched Telephone Network).
In 1986, BT introduced ISDN in the UK.
It replaced old analogue landlines to digital lines, adding features that weren’t available with a classic telephone system.
BT announced back in 2015 they will shut off their ISDN and PSTN services completely by December 2025.
Neither of these technologies are capable of delivering the volume or quality of voice data needed in this increasingly digital world.
Voice calls in the future will be made over the internet.
This is often referred to as VoIP (Voice over Internet Protocol), which makes use of newer technologies such as fibre optic connectivity.
Although ISDN has been improved a lot since 1986, the network has remained relatively unchanged and is now a little outdated.
Broadband internet connection speeds are a lot faster and at a higher level than ISDN.
In short, ISDN can no longer compete.
Traditional ISDN lines also offer little flexibility.
Businesses are tied to physical locations.
With the shift to cloud-based systems that are scalable and flexible for remote working, IP technology is a better choice to meet these demands.
In 2015, BT decided it didn’t make financial sense to keep making improvements to the ISDN network.
Why?
Well, BT can now focus their resources on up-to-date technology like VoIP, building services for the future, whilst meeting the growing demand from businesses.
There are two options that will replace ISDN, VoIP and SIP.
What is VoIP?
Voice over Internet Protocol (VoIP), also known as IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over IP networks.
With VoIP, analogue voice calls are converted into packets of data.
Packets travel like any other type of data, such as e-mail, over the public Internet and/or any private Internet Protocol (IP) network.
What is SIP?
Session Initiation Protocol (SIP) is a set of rules that are used in multimedia communications to initiate and terminate data transfer between different users.
It is the way you achieve a VoIP call.
SIP is the technology that creates, modifies, and terminates sessions with one or more parties in an IP network, whether a two-way call or a multi-party conference call.
Put simply:
Choose VoIP if you want to buy a whole new phone system when you make the switch from ISDN.
Or go with SIP if you want to keep your current system when you make the switch.
Choosing a hosted VoIP phone system is the best option for you, if you already have ISDN lines and don’t want to commit to a phone system on location.
Switching from ISDN to VoIP is very simple.
Two things you’ll need to consider:
Most new office phone systems support VoIP but if yours doesn’t, you’ll have to replace it with an IP phone system.
If your internet speed doesn’t have enough bandwidth to deliver voice and other features, you’ll need to upgrade it to one that does.
As they use virtual phone lines rather than physical lines, SIP and SIP Trunks are a great on-premise solution for a phone system.
You can choose systems like 3CX and Direct Routing for Microsoft Teams when using a SIP Trunk.
Due to their flexibility, speed, quality and lower costs, SIP Trunks are becoming the most popular alternative to ISDN.
Are you keeping your phone numbers?
Before you switch off ISDN for good, you’ll need a plan to port your numbers.
Number porting is the process of moving your telephone number from one provider to another.
If your business uses location-specific phone numbers or if you want to keep all your existing numbers, it’s a good idea to do this.
We offer number porting as part of our service.
This process can take up to a few weeks depending on your porting agreement with your previous provider and the amount of numbers you want to port.
Switching comes with many benefits which are listed below:
Cost
Cut your call charges, line rental and infrastructure costs dramatically.
Whatever you’re using right now, we are confident that switching will significantly cut your costs.
Fully Featured
A host of new capabilities that will transform the way you work.
There is a whole range of features that are either not available or just too expensive on landline systems.
Voicemail, conferencing, presence status, comprehensive exchange functions, switchboards, CRM integration, call on any device, and more.
Service
Improve the speed and efficiencies of your calls when dealing with customers.
VoIP gives you total control over your calls. It allows you to deal with customer calls faster and better than ever before, and reveals how you’re performing and where you could improve.
Communication
Combine phone calls, emails, messaging, scheduling, staff status, apps and your CRM into one unified system.
You can finally bring voice calls into your digital world, where they belong.
Robust
Disaster recovery specifically designed to bounce back within minimum downtime and data loss.
Store regular ‘snapshots’ of all your data – once daily to backup all your call recordings and specific configurations.
If your system fails, simply restore the last usable snapshot and you’re back up and running – usually within an hour.
When are you going to switch?
If you’ve already made the switch, well done you! 👏👏👏
If you haven’t, now would be an ideal time to consider the alternatives to ensure your business is prepared for the switch off.
Is your current phone system, IP compatible?
As ISDN will be replaced with IP, you need to look at whether your phone system is IP compatible.
If it isn’t compatible, then you need to invest in a newer model that is IP compatible.
If it is compatible, then you may wish to consider replacing your existing ISDN service with SIP Trunking.
Switching to IP relies so heavily on the internet.
This means you’ll also need to assess whether your internet connection is stable enough to support IP telecoms technology.
If your internet connection needs upgrading, it might be time to switch to a fibre optic connection or Ethernet-based leased line.
How long does it take to switch over?
The process can take a couple of weeks, but this will depend on the size of your business and existing infrastructure.
With our experience, we can make the process easier.
Taking care of the porting process, as well as working with you to make sure minimal disruption to your business activities at the time of the ISDN switch off.
We really hope you enjoyed our quick guide to the ISDN & PSTN Switch Off. Now we’d like to hear from you:
Do you have any further questions about this topic? Perhaps you need to prepare for this event? Either way, let us know your thoughts.
Power BI and Power BI Pro: Empowering SMEs with Data Insights Understanding and leveraging information effectively is no longer a luxury—it’s a necessity. For small and medium-sized enterprises (SMEs), the ability to make informed, data-driven decisions can set you apart…
Disaster Recovery: Why It’s Essential for Your Business Many business owners are natural optimists—after all, it’s that positive mindset that helps them build and grow successful companies. However, when it comes to disaster recovery, optimism alone won’t protect your business…