The End of ISDN


Client Stories

What does it mean for business?

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BT has announced that they intend to migrate all customers away from their ISDN network by 2025. Until now there has been no set date for the ISDN switch-off despite much discussion within the industry as to when BT might switch off their PSTN and ISDN networks.

The announcement from BT is the first step in taking them towards their vision of a single IP core network that replaces all legacy networks and platforms.

With over 3 million ISDN channels active in the UK, this will be a long process and BT will begin the migration process relatively soon in order to meet this ambitious target.

I use ISDN. What do I need to do?

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First of all, there’s no rush. BT have given themselves time to migrate customers away from ISDN, so your telephony services aren’t going to stop working overnight.

Nonetheless, this announcement is an opportunity for businesses to review their telephony services now in order to plan for the future. Moving to SIP trunking ahead of the ISDN switch off means you don’t have to wait to take advantage of VoIP benefits such as reduced call charges and flexible call routing.

SIP Trunking is a form of IP telephony and a replacement for traditional ISDN. In simple terms SIP allows the running of voice calls over your internet connection (Voice over IP, or VoIP).

The benefits of SIP and VoIP

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SIP trunks do not have the high line rental charges of ISDN

Voice & Connectivity


Included calls to 01, 02, 03 and UK mobile numbers.

Business Continuity


Your phone number is no longer tied to a geographic location when you move to SIP.

Managed IT Solutions


Add more SIP trunks to increase bandwidth and take more simultaneous calls.


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Client Stories

What are my options?

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For many modern businesses, moving to a hosted telephony service can provide significant benefits in terms of reduced capex, reduced support overheads and increased flexibility.

ITPS offers a number of options including Cloud Voice publicly and privately.

Free set up of the ITPS Cloud Connect system with a saving of £650.00
Free Calls Included: ITPS Cloud Connect includes UK Local, National and UK Mobile
Free All Inclusive: Inclusive features in licensing

Act now before it’s too late

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Contact us today to speak to one of our technology experts who’ll be happy to advise via our Unified Communications Department.

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