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ISDN and PSTN

Replacing ISDN and old phone lines before the 2027 switch-off.

By David White, Director, Padel Services · Updated October 2026

The short answer

ISDN30 and ISDN2 are replaced either by SIP lines into the phone system you already have, or by a cloud phone system that needs no phone system on site. Both keep your numbers. The right one depends on your phone system’s age and your internet connection.

Keep your system, or move to the cloud

If your phone system is recent and supports SIP, new lines can plug straight into it. If it is old or costly to maintain, a cloud phone system replaces it and the lines in one go.

Your internet carries the calls

Calls will run over your internet connection, so we check what is available at your address first: full fibre, a leased line, and a 4G or 5G backup that takes over on its own.

Your number ranges move with you

Main numbers and direct dial ranges all move across. We build the new setup in our workshop and keep the old lines live until the numbers move.

Check your phone system 03330 162 161

The questions businesses ask.

What replaces ISDN30 and ISDN2?

SIP lines into your existing phone system, or a cloud phone system. Both keep your numbers.

Can we keep our existing phone system?

Often, if it supports SIP and is still supported by its maker. We check it before recommending anything.

Will our current broadband carry the calls?

It depends on the line and how many calls you make at once. We check your address and your call volumes before we quote.

Is there any downtime when we move?

No. The new setup is built before we arrive, and your old lines stay live until your numbers move.

What happens to our direct dial number ranges?

They move with you, along with your main numbers.

Sources

Why we are different

What we don’t do.

This is not about knocking anyone else. It is the promises we keep, written the other way round, so you can hold us to them.

  • We don’t use day-rate subcontractors.Our own engineers install your system, and they answer for it afterwards.
  • We don’t employ commission-driven salespeople with targets.Our team is rewarded for how long customers stay with us, so the right answer matters more than the sale.
  • We don’t sell the cheapest option to win on price.We quote what will actually work for your business, and show you why.
  • We don’t cut corners on a solution to win a deal.What we propose is what we would put in our own office.
  • We don’t hand you an off-the-shelf setup.Every system is configured for how your business works: your call flows, your teams, your hours.
  • We don’t take your business offline to switch.It is built before we arrive, and your old system stays live until your numbers move. No downtime, no disruption.
  • We don’t hide behind tickets and emails.Ring us and you speak to a person who can see your whole account.
  • We don’t pass your query between departments for days.One team owns it until it is fixed.
  • We don’t sell what suits us instead of you.If what you have is right, we will tell you to keep it.

More guides

The switch-offSwitchingBroadband problemsEssexIT support

The Keep-It Promise

If what you have is right, we will tell you to keep it.

Start the check above, or ring us and ask anything.

Check your phone system 03330 162 161