Twilio - Spikes in Call Signing Failures

Incident Report for Ciptex

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 - 18:04 BST

Update

Twilio 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. Twilio 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 - 17:28 BST

Investigating

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.

Posted Sep 20, 2025 - 17:25 BST

This incident affected: Twilio (Twilio PSTN).