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

Talk with Us
Email Us
Home>>Products & Services>>Telephony>>VoIP On-Site Phone Systems

In April 2025, the UKs ISDN telephony system will be withdrawn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In April 2025, the UKs ISDN telephony system will be withdrawn.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

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 - 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.

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

Business running smoothly during lockdown

The team at Pink look after our needs and requirements superbly. Their service over the lockdown period has, without a doubt, helped to keep our business running smoothly over some very difficult times. They have been quick to respond to requests for changes to the way our system is set up and have resolved issues promptly.

H Pole

First Class

We had a problem with the software and Pink Connect identified the problem and rectified it. First class service from Pink Connect.

D Henderson

Always Helpful!

Pink connect team are always helpful and incredibly fast to respond to any questions or problems I have. I would recommend them to anyone!

M Price

The service is excellent!

The service is excellent. When there is a problem, you get through to an advisor within a few minutes and a ticket is raised and any issues usual are resolved quickly. On the odd occasion it may take a couple of hours, but their communication is excellent about the status of any issue.

D Jones

Thank you

Pink Connect who offers support to our company is always very helpful and looks into issues to try and solve them in the best way possible. Thank you for your patience and support, Pink Connect!

Z Vilsdorfa