Can VoIP Work Without the Internet?
A clear, direct answer to this question — written for UK business owners and IT decision-makers.
Direct Answer
VoIP requires an active internet connection to function. Without internet, VoIP calls cannot be made or received. Good hosted VoIP systems include failover routing — automatically diverting inbound calls to mobile numbers or alternative sites if your internet connection fails — ensuring business continuity during outages.
Key Points
What you need to know.
The Short Answer
31% of UK businesses have switched to VoIP as of 2025 — the fastest adoption rate of any business communication technology in recent history.
For UK Businesses
The PSTN will be switched off by 31 January 2027. Over two-thirds of UK landlines have already been upgraded to VoIP.
Cost Considerations
VoIP systems can reduce communication costs by up to 75%. Small businesses typically see 25–50% lower costs than traditional telephony.
Next Steps
About 1 in 5 business leaders say they have lost business due to poor communication.
Quick Comparison
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Frequently Asked Questions
The PSTN switch-off is scheduled for January 2027. Around 2.4 million UK businesses still operate on PSTN or ISDN lines. FTTC broadband that relies on PSTN copper lines will also cease to function. Businesses must migrate to IP-based telephony and connectivity before the deadline.
Direct Routing connects your Microsoft Teams environment to the PSTN via a certified Session Border Controller, enabling external calls from Teams. It provides more flexibility and often lower per-minute costs than Microsoft Calling Plans. It is ideal for businesses already using Microsoft 365.
Cloud-hosted VoIP typically costs £8-£25 per user per month depending on features. This includes calls, voicemail, mobile apps, and call recording. Most businesses save 40-60% compared to traditional PSTN costs. Microsoft Teams calling plans offer another option within the M365 ecosystem.
Yes. UK businesses can port their existing geographic and non-geographic numbers to their new VoIP provider. Number porting requires a minimum lead time of 4-7 working days. Under the PSTN switch-off, phone numbers are not lost — they transfer through the porting process.
Yes, when paired with adequate connectivity. Modern VoIP systems on leased lines or FTTP deliver HD voice quality with latency under 9ms. 97% of UK workers say communication impacts their daily task efficiency. VoIP outperforms traditional telephony on features, cost, and flexibility.
Need More Detail?
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