Ciptex incident
Twilio - Voice Call Audio Quality Degradation Between Twilio Phone Numbers and Multiple Networks in United Kingdom
Resolved after 4 hours 36 minutes, affecting Twilio Voice, Europe, on July 21, 2026.
Following comprehensive monitoring, we can confirm that the incident has been fully resolved and all services have returned to normal operation.
Affected components
Update timeline
- investigating Jul 21, 2026, 10:15 AM UTC
We have detected potential service disruption through our monitoring systems and are actively investigating. A detailed assessment of the impact and affected services will be provided within the next 30 minutes.
- investigating Jul 21, 2026, 10:20 AM UTC
We are continuing to investigate this issue.
- identified Jul 21, 2026, 12:46 PM UTC
Twilio customers may be experiencing voice call audio quality degradation between Twilio Phone Numbers and network subscribers on multiple networks in the United Kingdom. Twilio team has identified the cause, and is working to resolve the issue. We will provide another update in 1 hour or as soon as more information becomes available.
- monitoring Jul 21, 2026, 02:49 PM UTC
Twilio have observed a recovery in voice calls between Twilio Phone Numbers and network subscribers on multiple networks in the United Kingdom and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available
- resolved Jul 21, 2026, 02:51 PM UTC
Following comprehensive monitoring, we can confirm that the incident has been fully resolved and all services have returned to normal operation.
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