Twilio: Outbound Call Failures to a Subset of UK Numbers
GitHub outage, May 9, 2023 · 7 vendors, 9 incidents
Twilio’s incident started in the same window without naming GitHub (timing only, not evidence of a link). (timing only, posted +3 h 12 min vs GitHub’s own post)
Swipe sideways to see the whole diagram.
Mermaid source
flowchart LR
root["GitHub<br/>posted 08:07 UTC"]:::root
h4["1 to 4 hours later<br/>2 vendors, 2 blamed GitHub<br/>v0, Vercel"]:::blames
root --> h4
me["Twilio (this incident)<br/>posted +3 h 12 min"]:::me
root -.->|"same window"| meFull event: timeline, evidence and all vendors →
Detected automatically from incidents that started together and named the same provider. A link means one vendor’s incident named another, not a confirmed cause.
Timeline of updates
- resolved
We are no longer experiencing outbound call failures to a subset of UK numbers. This incident has been resolved.
From Twilio’s published incident history: for incidents before Rewindex began polling this status page, only the final update text is available.
Archive proof
Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert.
How the archive is checked, and what it cannot prove.
This incident predates live tracking (October 17, 2026). It came from the vendor’s own published history, which is not covered by checkpoints.
Impact, status and times are the vendor’s own, as last archived. View on status.twilio.com (opens in new tab).