# Twilio: Voice Call Audio Quality Degradation Between Twilio Phone Numbers and Multiple Networks in United Kingdom

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-07-21 10:12 UTC · Resolved: 2026-07-21 14:47 UTC · Duration: 4.6 h
- Updates: 1
- [Vendor status page: https://status.twilio.com/incidents/36v9dgvm78zx](https://status.twilio.com/incidents/36v9dgvm78zx)
- [Company: Twilio](https://rewindex.com/company/twilio.md)

## Part of an outage event

- [GitHub outage, Jul 21, 2026: 15 vendors, 19 incidents](https://rewindex.com/events/2026-07-21-github)
- This incident started in the same window without naming GitHub (timing only, not evidence of a link). (timing only, posted −19 min vs GitHub’s own post)

```mermaid
flowchart LR
  root["GitHub<br/>posted 10:31 UTC"]:::root
  before["Posted before GitHub did<br/>1 vendor, 1 blamed GitHub<br/>Semaphore"]:::blames
  root --> before
  h1["Within an hour<br/>2 vendors, 2 blamed GitHub<br/>HashiCorp, Terraform Cloud (HCP)"]:::blames
  root --> h1
  later["Later<br/>1 vendor, 1 blamed GitHub<br/>Mintlify"]:::blames
  root --> later
  p0["Anthropic<br/>posted −20 min, did not name GitHub"]:::timing
  root -.-> p0
  k0["Bolt.new, Cursor<br/>−16 min to +7 h 14 min"]:::hop2
  p0 -->|"blamed Anthropic"| k0
  me["Twilio (this incident)<br/>posted −19 min"]:::me
  root -.->|"same window"| me
```

_Detected automatically from incidents that started together and named the same provider; a link means one incident named another vendor, not a confirmed cause._

## Timeline of updates

- **resolved** 2026-07-21 14:47 UTC: We have observed a recovery in voice calls between Twilio Phone Numbers and network subscribers on multiple networks in the United Kingdom and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._


---
Canonical: https://rewindex.com/company/twilio/incidents/36v9dgvm78zx · Markdown: https://rewindex.com/company/twilio/incidents/36v9dgvm78zx.md · JSON: https://rewindex.com/api/v1/companies/twilio/incidents/36v9dgvm78zx · Generated 2026-10-20T01:31:57.287Z