# Sinch: Calling Services - Performance Degradation

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2021-12-22 12:45 UTC · Resolved: 2021-12-22 14:29 UTC · Duration: 1.7 h
- Updates: 1
- [Vendor status page: https://status.sinch.com/incidents/pz1my9k9nnrn](https://status.sinch.com/incidents/pz1my9k9nnrn)
- [Company: Sinch](https://rewindex.com/company/sinch.md)

## Part of an outage event

- [AWS us-east-1 outage, Dec 22, 2021: 40 vendors, 40 incidents](https://rewindex.com/events/2021-12-22-aws-us-east-1)
- This incident started in the same window without naming AWS (timing only, not evidence of a link). (timing only, posted +3 min vs the first vendor naming AWS)

```mermaid
flowchart LR
  root["AWS us-east-1<br/>own incident not archived"]:::inferred
  h1["Within an hour<br/>8 vendors, 6 blamed AWS<br/>Firebolt, Bitbucket, HubSpot, CircleCI +4"]:::blames
  root --> h1
  h4["1 to 4 hours later<br/>1 vendor<br/>Confluent"]:::names
  root --> h4
  me["Sinch (this incident)<br/>posted +3 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** 2021-12-22 14:29 UTC: Dear Client, We are writing to inform you that we are observing a stable performance for our calling service. Incident start time: 2021-12-22 12:12 UTC Incident restoration time: 2021-12-22 13:33 UTC Incident stop time: 2021-12-22 13:35 UTC If you have any further questions or concerns, please do not hesitate to reach out to support@sinch.com.

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


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Canonical: https://rewindex.com/company/sinch/incidents/pz1my9k9nnrn · Markdown: https://rewindex.com/company/sinch/incidents/pz1my9k9nnrn.md · JSON: https://rewindex.com/api/v1/companies/sinch/incidents/pz1my9k9nnrn · Generated 2026-10-20T00:06:09.184Z