Ciptex incident

Twilio - Voice Call Audio Quality Degradation between a Subset of Twilio Phone Numbers and T-Mobile in United States

Minor Resolved View vendor source →

Ciptex experienced a minor incident on May 12, 2026 affecting Twilio PSTN and Twilio Voice, North America, lasting 1d 20h. The incident has been resolved; the full update timeline is below.

Started
May 12, 2026, 12:15 AM UTC
Resolved
May 13, 2026, 09:12 PM UTC
Duration
1d 20h
Detected by Pingoru
May 12, 2026, 12:15 AM UTC

Affected components

Twilio PSTNTwilio Voice, North America

Update timeline

  1. investigating May 11, 2026, 04:05 PM 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.

  2. identified May 11, 2026, 06:14 PM UTC

    Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. The Twilio team has identified the cause, and is working to resolve the issue. We will provide another update in 2 hours or as soon as more information becomes available.

  3. identified May 11, 2026, 08:01 PM UTC

    Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. The Twilio engineering team has identified the cause, and is working to resolve the issue. We will provide another update in 4 hours or as soon as more information becomes available.

  4. monitoring May 12, 2026, 05:55 AM UTC

    Twilio has observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 10 hours or as soon as more information becomes available.

  5. monitoring May 12, 2026, 09:36 AM UTC

    Twilio has observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

  6. monitoring May 12, 2026, 02:40 PM UTC

    Twilio has observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 16 hours or as soon as more information becomes available.

  7. monitoring May 12, 2026, 06:15 PM UTC

    Twilio has observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

  8. monitoring May 13, 2026, 09:42 AM UTC

    Twilio has observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 16 hours or as soon as more information becomes available.

  9. resolved May 13, 2026, 09:12 PM UTC

    Following comprehensive monitoring, we can confirm that the incident has been fully resolved and all services have returned to normal operation.