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Telexico Knowledge Base

How Failover Internet Works: A Business Guide

Internet failover is a backup connection that activates automatically when your main line drops. Here's how it works and why it matters for your business.

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Telexico Editorial Team ยท Updated March 2026

The basic concept

A failover router monitors your primary connection constantly. If it detects a failure, it switches to a backup 4G/5G connection in seconds โ€” no action required from you or your staff.

What hardware is involved

A dual-WAN router supports both your main fibre/broadband and a 4G/5G SIM. Our Assure X service uses enterprise-grade DrayTek and Cradlepoint routers. Consumer 4G dongles will not switch automatically.

Multi-network SIMs

We use SIMs that roam across EE, O2, Vodafone and Three. If one network has issues in your area, the SIM connects to the next โ€” far more resilient than a single-network SIM.

How fast is the switchover?

Assure X switches in under 30 seconds. Cheaper solutions can take 2-3 minutes โ€” during which calls drop and card transactions fail. Always ask your provider for the specific switchover time.

What keeps working during failover

VoIP phones, card payments, cloud software, CCTV remote access and email all continue working through Assure X failover. Staff typically don't notice the switchover.

Failover vs SD-WAN

Failover is reactive โ€” it activates when the primary fails. SD-WAN is proactive โ€” it uses both connections simultaneously, routing traffic intelligently across them. Assure X can be configured either way.

VoIP Phone Systems โ†’ Business Broadband โ†’ Internet Failover โ†’ Leased Lines โ†’

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