Twilio: Subset of Inbound Calls from AT&T are Failing Shaken/Stir Verification

What to do

Check whether you use Twilio Voice, North America in us. Check your stack
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Confirm your retries, queues and scheduled jobs caught up after the 4h 56m it lasted.
Anything that failed between 2026-06-03 18:40 UTC and 2026-06-03 23:36 UTC may need a replay.
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investigatingJun 3, 2026, 6:40 PM UTC
Our monitoring systems have detected a potential issue with Shaken/Stir validation for a subset of inbound calls. Our engineers have been alerted and are investigating. We will provide an update when we have more details.
provider
investigatingJun 3, 2026, 7:42 PM UTC
Twilio customers may be experiencing Shaken/Stir verification failures for inbound calls originating from the AT&T network the United States. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.
provider
investigatingJun 3, 2026, 8:42 PM UTC
Twilio customers may be experiencing Shaken/Stir verification failures for inbound calls originating from the AT&T network the United States. Our team is actively investigating this issue. We will provide another update in 2 hours or as soon as more information becomes available.
provider
monitoringJun 3, 2026, 11:03 PM UTC
We have started seeing recovery for Shaken/Stir verification failures for inbound calls originating from the AT&T network the United States. We will continue to monitor to ensure a full recovery. We expect to provide another update in 30 minutes or as soon as more information becomes available.
provider
resolvedJun 3, 2026, 11:36 PM UTC
The issues for Shaken/Stir verification failures for inbound calls originating from the AT&T network the United States has been resolved and it is operating normally at this time.
provider

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Is Twilio still down?

No, this incident was resolved 2026-06-03 23:36 UTC. For Twilio's live state, see https://down.guide/twilio.

How long did it last?

4h 56m, from 2026-06-03 18:40 UTC to 2026-06-03 23:36 UTC, by the times Twilio posted.

What was affected?

Twilio named Voice, North America in us.

What caused it?

Twilio hasn't published a root cause. If it does, it shows here.

Where does this come from?

Twilio's official status page, https://status.twilio.com, quoted verbatim. down.guide's own probes, reports and social counts are labeled as ours.