Spikes in Call Signing Failures

Incident Report for Twilio

Resolved

The issue affecting a small subset of calls that may have completed without STIR/SHAKEN signature has been resolved, and the service is functioning normally at this time.

Posted Sep 20, 2025 - 10:03 PDT

Monitoring

We have started seeing recovery for a small subset of calls that may have completed without STIR/SHAKEN signature. 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.

Posted Sep 20, 2025 - 09:33 PDT

Update

We are observing a small subset of calls that may have completed without STIR/SHAKEN signature, which could cause carriers to treat the call as spam. Our engineering teams are actively working to resolve these issues. We expect to provide another update in 1 hour or as soon as more information becomes available.

Posted Sep 20, 2025 - 09:24 PDT

Investigating

Our monitoring systems have detected a potential issue with call signing failures. Our engineering team has been alerted and is actively investigating. We will update as soon as we have more information.

Posted Sep 20, 2025 - 09:12 PDT

This incident affected: PROGRAMMABLE VOICE US1 (PSTN US1).