VoIP On-Site Phone System

There are currently 2 million business using ISDN phone systems in the UK in need of an upgrade to a scalable, flexible VoIP system

In April 2025, the UKs ISDN telephony system will be withdrawn

Are you ready?

As well as reducing costs and time investment into your phone system, VoIP brings many other benefits.

Because VoIP is implemented over your internet connection, it’s easy to set-up, highly scalable and offers a greater degree of flexibility and agility to your workforce.

VoIP phone systems make it easy to keep up with emerging technology, future-proofing your business and enabling you to be brilliant.

The decline of ISDN

In April 2025, the UKs ISDN telephony system will be withdrawn. This will be complete by December 2025. This seems a while away but, given there are currently 2 Million business using ISDN phone systems in the UK, there will as in Germany in 2018, be a mad scramble to move to Voice over IP, leaving thousands of business disconnected.

Whether you are simply looking for a phone system or would like to integrate communications with your core systems and business processes, we can help.

photo graphic of a voip phone device

VoIP The Future Today

Make the switch

We recommend business move from the legacy ISDN system to Voice over IP without delay, since the feature set of VoIP systems leave legacy techlology floundering and the capital cost reductions in hardware, often zero, maintenance, also zero and call costs, yes also zero, will surprise you. Voice over IP, the future today… 

Here are the top 4 benefits of SIP over ISDN:

Number portability and flexibility

There is not geographical location requirements for numbers and SIP permits out-of-area numbers to be used since your phone number is attached to an IP address instead of a physical telephone line. So, for instance a New York number may point to an office in London. Additionally, ISDN takes 6-8 weeks to implement, whereas SIP takes 24 hours to spin up and spin down.

Pink IP Pro Yealink-W60B Handset
Pink IP Pro - Cisco Deskphone


The bottom line is important for every business and with SIP savings are substantial. With ISDN your voice and data are on different lines, whereas with SIP you can reduce costs by having them on the same one. Also, SIP trunks can greatly reduce call charges including international calls and free calls between multiple sites and offices on the same network.

You can calculate the cost savings of adopting SIP with Gamma’s SIP vs. ISDN cost calculator and see for yourself.


SIP is deployed across your business’s existing WAN which means that you can add additional trunks in high demand and subtract them in low demand respectively in order to easily scale your telephony needs according to your business needs.

Cisco VoIP Phone 8865
VoIP Handset

Disaster Recovery

Incidents happen and at some point your service could be interrupted by a network failure, a hardware problem, natural disaster or just bad weather. Luckily, one of the biggest benefits of SIP Trunks is the better reliability and much simpler disaster recovery when compared to legacy phone systems. If your business needs a zero downtime environment, SIP trunks allow automatic failover solutions to be implemented so that your numbers will divert to other locations without loss in service.

We hope this article has been of interest. If you want to migrate to SIP please contact us and we will be happy to help.

Order Your IP Phone Solution Today

For more information regarding VoIP, please contact us on 0345 450 9393 (opt 1) or email to tellmemore@pinkconnect.com

What Businesses Say About Us

Omar sorted out the issue I was experiencing quickly and explained how I can fix the issue myself should it happen again. He made some changes to the system so in theory it won’t happen again.

Zarvin Wildey

Claire has been our personal agent providing our telecoms service with the latest up to date technology for over past 10 years now.

Claire recently supplied an App for our mobiles, so our brokers are in touch with the main office wherever they are. Claire’s service is Outstanding along with her products.

If you want your business to have the best communication with your clients… talk to Claire!


Completely satisfied with my new communications installation, from enquiry to pricing, to implementation. Attention to detail has been exemplary.

S Spinks

It really has been invaluable and so reassuring to know that you have been on the end of an email or phone to make the changes that we have asked for.  It has made our lives so much less stressful to know that we have had the flexibility that the system offers and has enabled us all to carry on working and looking after our clients.

H. Pole

Amazing company to work with, they have all been so proactive and helpful, nothing has been too much trouble and we are so pleased with our new phone system. It also came in at a saving for the charity compared to our previous supplier. I couldn’t recommend the Pink team highly enough.

H. Makaritis