With the UK’s switch from traditional copper landlines to VoIP (Voice over Internet Protocol) systems already underway, many people wonder whether their landline call blockers will still work.
The short answer is yes — most modern call blockers, including CPR Call Blocker, are compatible with VoIP-based home phone systems. However, there are a few key points to know before setup.
What Is a VoIP Home Phone System?
VoIP systems transmit calls over the internet rather than traditional copper wiring. Instead of plugging your phone into a wall socket, you connect it to a router or VoIP adapter.
Major UK providers such as BT (Digital Voice), Sky Talk, Virgin Media, and TalkTalk now use VoIP technology as part of the UK’s digital switchover.
Summary: VoIP systems use the internet instead of copper wiring, connecting phones through a router or adapter rather than a wall socket.
Why Compatibility Matters
Traditional landline call blockers plug directly into the wall socket, intercepting calls before they reach your handset. With VoIP, the “wall socket” becomes your router’s TEL port or a VoIP adapter.
This raises common questions like:
- Will my existing call blocker still work?
- Do I need a VoIP-compatible model?
- Can it still detect scam or withheld numbers?
Summary: VoIP changes where and how you connect your phone, so setup requires minor adjustments to maintain full protection.
Are Landline Call Blockers Compatible with VoIP Lines?
Yes, most are. Call blockers like the CPR Call Blocker V100K and V5000 are designed to work with both analog and VoIP systems that use a standard RJ11 phone connection.
They are compatible with:
- BT Digital Voice (via Smart Hub or Digital Voice Adapter)
- Sky Broadband Talk
- Virgin Media Hub
- TalkTalk VoIP lines
As long as your VoIP router or adapter has a standard phone port and Caller ID (CLI) is enabled, your call blocker will work exactly as it did on a copper line.
Summary: Most modern call blockers work perfectly with VoIP systems that support RJ11 ports and Caller ID.
How to Connect a Call Blocker to a VoIP Router
Here’s a simple step-by-step setup:
- Locate the TEL port on your router or VoIP adapter.
- Plug your call blocker’s line cable into that TEL port.
- Connect your phone base unit into the call blocker’s “Phone” port.
- Activate Caller ID with your provider.
- Make a test call to ensure the device intercepts correctly.
This setup ensures that all calls pass through your blocker before reaching your handset.
Summary: Simply plug the call blocker into your router’s TEL port and your handset into the device for full VoIP protection.
Why Caller ID Is Crucial
For your call blocker to identify and block numbers effectively, Caller ID must be active on your VoIP service. Without it, the device can’t read or filter incoming calls.
To enable Caller ID:
- BT: Usually included with Digital Voice.
- Sky or TalkTalk: Request activation through your account or customer service.
- Virgin Media: May require enabling via your Hub settings.
Summary: Ensure Caller ID is turned on so your call blocker can recognise and filter scam calls accurately.
What If Your Call Blocker Isn’t Working with VoIP?
Try these quick checks:
- Confirm you’re connected to the TEL port, not an Ethernet port.
- Restart both your router and call blocker.
- Ensure your device firmware or memory hasn’t reached capacity.
- Contact your provider to confirm Caller ID transmission over VoIP.
If your call blocker is several years old, consider upgrading to a newer VoIP-compatible model such as the CPR Call Blocker V100K for improved performance.
Summary: Most compatibility issues come down to connection ports or Caller ID settings — both easy fixes.
The Future of Landline Call Blocking
As the UK’s 2025 PSTN switch-off approaches, every household will move to digital calling. The good news? CPR Call Blockers are already designed for this transition.
They remain compatible with both analog and VoIP-based home systems, ensuring ongoing protection from scam and nuisance calls.
Summary: CPR Call Blockers are future-proof and ready for the UK’s digital phone transition.
Conclusion
Landline call blockers are fully compatible with most VoIP home phone systems — including BT Digital Voice, Sky, and Virgin Media. By connecting through your router’s TEL port and enabling Caller ID, you’ll continue to enjoy peace of mind and scam-free communication.
Explore CPR Call Blocker V100K to protect your loved ones today.
FAQs
Q: Will my call blocker still work after the digital switchover?
A: Yes—modern devices like CPR Call Blocker are VoIP-compatible.
Q: Do I need internet for the call blocker to work?
A: Only if your landline uses VoIP; the device itself doesn’t require Wi-Fi.
Q: What kind of cable does it use?
A: A standard RJ11 phone cable, included with the product.
Q: Is Caller ID required for VoIP compatibility?
A: Yes—enable Caller ID through your provider.
