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ISDN Migration to VoIP

  • here's how to efficiently switch from isdn to voip

avoid communication issues by migrating to voip today

BT Openreach are switching off their PSTN and ISDN services in December 2025. After this date, traditional telephone lines – which many businesses still rely on – will no longer work. 

Other technology systems that run on traditional telephone lines – such as CCTV cameras, fax machines and point-of-sale (EPOS) devices – will also be affected and will no longer work as required.

Around 2.4 million businesses in the UK still operate on PSTN or ISDN, most of which are SMEs – if you’re one of them you should start planning your move to VoIP today. 

You may think you still have plenty of time to migrate to VoIP, but for many companies, the migration is happening NOW.

Read on to find out more about migrating from ISDN to VoIP…

More about the isdn switch off

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What is voip?

VoIP stands for voice over internet protocol and is a cloud-based telephony solution.

VoIP can also be referred to as “internet telephony” and “IP telephony”.

VoIP services transmit voice and multimedia content via an internet connection. This means phone and video calls can be made from anywhere, at any time, using only a mobile device and an internet connection, which makes VoIP the perfect solution for businesses with remote and hybrid workers.

VoIP typically includes other features that aren’t available with traditional phone systems. These features can include call recording, custom caller ID, and voicemail to e-mail. This is why VoIP is also known as a unified communications (UC) solution.

As VoIP systems are cloud-based, they eliminate the need for telephone boxes, cabling and other on-site hardware.

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how to migrate to voip

VoIP phone systems offer a wealth of business benefits, including an easy setup process. Here are the steps you’ll need to take to successfully migrate from ISDN to VoIP:

1. audit your current isdn/pstn provision

The migration to VoIP will take some planning. You’ll need to take a look at your current phone setup, catalogue everything you have and identify additional features you want to implement. Questions to consider include:

  • Will you be keeping desk phones or switching to an application (desktop or mobile) based system?
  • How many phone numbers do you have and how many do you actually need?
  • Do you require voicemail, voice recording, call routing, call queues or other additional features?
  • Do you need extensions for different departments or individuals?

You’ll also need to assess the strength and speed of your internet connection. Most VoIP issues stem from poor connectivity, so making sure your internet connection is fast and stable enough is essential. To achieve a voice call of sufficient quality, a minimum internet speed of 90 – 100 kbps is required. This amount must be multiplied per user. For example, if you have 10 VoIP handsets in use, you will require around 1Mbps of bandwidth.
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2. Draw up a migration plan

With a clear picture of your ISDN/PSTN provision, you can now draw up a plan for your new VoIP solution.

Identify the features you want and expect from your new VoIP system, such as call queuing/ auto attendants, and define your overarching business goal – whether that be reduced operating costs or easier scalability. 

You can then start planning the finer details and asking for employee feedback on the communication processes they’d like to see introduced. 

Your migration plan is important for the next step, since it will help determine the VoIP provider you choose.

3. choose a voip provider

The best VoIP services are the ones that enable Unified Communications (UC), bringing together voice, video and data connectivity.

You should see your migration to VoIP as an opportunity to upgrade your business’s communication approach, so it’s best to look for a VoIP provider that offers different add-ons to their service plans.

VoIP features to consider include:

  • Video and audio conferencing
  • Advanced call routing
  • Mobile app integration
  • CRM integration
  • Advanced call analytics


It’s also important to ensure you choose a service provider that offers excellent customer support and security. VoIP systems are held in the cloud, so strong security measures are essential to keep your network and data protected.

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4. setup your new voip solution

Once you’ve chosen your VoIP provider, it’s time to complete your office setup. Although VoIP technology itself doesn’t require any special hardware to run, you’ll need to connect some devices in order to start receiving calls.

For instance, some employees might want to connect their mobile phones to the VoIP interface, while others might want to continue using their desk phone. 

Remote/hybrid workers will also need to ensure their smartphones, tablets or laptops are connected. 

VoIP providers will often help to connect devices initially to ensure your VoIP system runs as it should. 

5. test your new voip lines

Once your provider has finished setting up your new VoIP system, it’s important to test your VoIP connections.

Try calling someone or have someone call you so you can check the audio quality, latency and connection stability. If the call drops, or if there are audio delays, then these can be looked into instantly before they cause too many issues.

It’s also good practice to test the call quality of your new VoIP system when there’s a lot of network activity. Network congestion may affect call quality. This can be ironed out at the start if you highlight the problem during the testing stage. 

Don’t forget to test the other functions of your VoIP system too. Features such as call routing, automated attendant services and remote communication should be tested as soon as possible so that any issues can be remedied quickly. 

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