# Telnyx: SDK Client Credential API Failure 

- Impact (vendor’s label): critical
- Status: resolved
- Started: 2026-08-04 17:19 UTC · Resolved: 2026-08-06 09:29 UTC · Duration: 40 h
- Updates: 3 · Affected components: San Jose, CA, Ashburn, VA, London, UK, Chicago, IL, Sydney, Australia
- [Vendor status page: https://status.telnyx.com/incidents/01KZ6WJVHHSKEW13396GJYT9DV](https://status.telnyx.com/incidents/01KZ6WJVHHSKEW13396GJYT9DV)
- [Company: Telnyx](https://rewindex.com/company/telnyx.md)

## Timeline of updates

- **investigating** 2026-08-04 17:19 UTC: customers may receive HTTP 503 responses from the Client Credential API, which can prevent telephony token creation or validation. This may cause Voice SDK authentication failures, failed registrations, and new call setup failures. Existing active calls are likely unaffected unless they require a fresh token/API call.
- **monitoring** 2026-08-04 19:00 UTC: We identified a capacity issue in the backend service that manages telephony tokens and client SDK credentials. This caused intermittent failures for some credential-related API requests. We increased the number of service pods and raised CPU and memory allocation to better handle request volume. Since making these changes, we are no longer seeing the related 503 errors at the API gateway. The service is currently stable, and we will continue monitoring closely while the incident remains in the monitoring phase.
- **resolved** 2026-08-06 09:29 UTC: We identified and mitigated a capacity issue in the backend service that manages telephony tokens and client SDK credentials. This caused intermittent HTTP 503 responses for some credential-related API requests.   After increasing service capacity and resource allocation, the service remained stable throughout the monitoring period. We will continue reviewing capacity settings to help prevent recurrence.

## Rewindex changes for this incident

- 2026-08-04 17:19 UTC: [Critical incident: SDK Client Credential API Failure](https://rewindex.com/change/if3e125c52d985e.md)


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Canonical: https://rewindex.com/company/telnyx/incidents/01KZ6WJVHHSKEW13396GJYT9DV · Markdown: https://rewindex.com/company/telnyx/incidents/01KZ6WJVHHSKEW13396GJYT9DV.md · JSON: https://rewindex.com/api/v1/companies/telnyx/incidents/01KZ6WJVHHSKEW13396GJYT9DV · Generated 2026-10-19T21:10:47.436Z