# GB VoIP Failures

- Provider: [Duo Security](https://down.guide/duo)
- Level: confirmed
- Impact: Partial outage
- lasted 10h 48m
- started 2025-07-24 13:55 UTC
- Phone Call Delivery, Phone Call Delivery, Phone Call Delivery +76
- id: DWN-4b9b2f0e87
- Official page: https://stspg.io/xfw8dtyrf5zm

## Updates from Duo Security
### 2025-07-24 13:44 UTC: investigating
We are currently investigating an issue caused by our UK telephony providers regarding VoIP failures with Duo on DUO70 and are working to correct the issue as soon as possible.
Please check back here or subscribe to updates for any changes.

### 2025-07-24 13:55 UTC: investigating
We are currently investigating an issue caused by our UK telephony providers regarding VoIP failures with Duo on DUO70 and are working to correct the issue as soon as possible.
Please check back here or subscribe to updates for any changes.

### 2025-07-24 14:25 UTC: identified
We have identified the cause of the VoIP authentication failures in Great Britain and our telephony providers in the region are actively working to restore service.
While we are monitoring this, please use alternate authentication methods such as Duo Push, Duo Mobile Passcodes, Hardware Token etc. to login to your Duo-protected integrations.

### 2025-07-24 15:04 UTC: monitoring
We are actively monitoring the VoIP phone call authentication issue affecting Great Britain.

### 2025-07-24 17:27 UTC: identified
We're continuing to partner with our telephony providers in the region as they work to restore service.
Please use alternate authentication methods such as Duo Push, Duo Mobile Passcodes, Hardware Token etc. to login to your Duo-protected integrations until the issue has been resolved.

### 2025-07-24 23:02 UTC: monitoring
The issue causing VoIP authentication failures in Great Britain appear to be resolved. We are continuing to monitor the situation closely and will post any updates when the incident is considered fully resolved.

### 2025-07-25 00:43 UTC: resolved
The issue causing VoIP authentication failures in Great Britain is now resolved.

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