ISDN Switch-Off 2027: What UK Businesses Need to Know

BT has confirmed that the ISDN network will be switched off in 2027. This means every UK business still using ISDN or traditional phone lines needs to migrate to VoIP (Voice over IP) or alternative digital services.

What is the ISDN Switch-Off?

The ISDN (Integrated Services Digital Network) switch-off is BT's plan to retire its legacy telephone network. Originally scheduled for 2025, the deadline was extended to 2027 to give businesses more time to prepare.

Why is This Happening?

BT is decommissioning the Public Switched Telephone Network (PSTN) because:

1. It's outdated and expensive to maintain

2. Modern IP-based networks are more efficient

3. Almost all new services are delivered over fibre or IP

4. The majority of UK premises now have access to fibre broadband

What Does This Mean for Your Business?

If you're still using ISDN lines or traditional phone lines:

**You must switch** — there is no opt-out

**You need to act** — installation lead times are growing as demand increases

**You can save money** — VoIP typically costs 50-70% less than ISDN

How to Prepare

1. **Audit your current services** — identify all ISDN and PSTN lines

2. **Check your broadband** — VoIP needs a stable internet connection

3. **Compare VoIP providers** — we can help with this

4. **Plan the migration** — allow 4-8 weeks for implementation

5. **Test everything** — ensure your new system works before the cut-off

Get Help

We're helping hundreds of UK businesses migrate from ISDN to VoIP. Contact us for a free audit and migration plan.