GB VoIP Failures

What to do

• Check whether you use Duo Security Phone Call Delivery, Phone Call Delivery, Phone Call Delivery, Phone Call Delivery and 75 more. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 10h 48m it lasted.

  Anything that failed between 2025-07-24 13:55 UTC and 2025-07-25 00:43 UTC may need a replay.

• Subscribe to Duo Security's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=duo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Duo Security 7

1. investigatingJul 24, 2025, 1:44 PM UTC

   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.

   provider

2. investigatingJul 24, 2025, 1:55 PM UTC

   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.

   provider

3. identifiedJul 24, 2025, 2:25 PM UTC

   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.

   provider

4. monitoringJul 24, 2025, 3:04 PM UTC

   We are actively monitoring the VoIP phone call authentication issue affecting Great Britain.

   provider

5. identifiedJul 24, 2025, 5:27 PM UTC

   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.

   provider

6. monitoringJul 24, 2025, 11:02 PM UTC

   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.

   provider

7. resolvedJul 25, 2025, 12:43 AM UTC

   The issue causing VoIP authentication failures in Great Britain is now resolved.

   provider

Corrections

None so far.

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