# Voice Call Failures from a Subset of Twilio Phone Numbers to Telefonica Argentina

- Provider: [Twilio](https://down.guide/twilio)
- Level: confirmed
- Impact: Degraded
- ongoing for 1d
- started 2026-11-05 18:34 UTC
- Voice, Latin America
- id: DWN-69a8508807
- Official page: https://stspg.io/t4vp65pctxst

## Summary
The provider says Twilio customers may be seeing voice call failures from a subset of Twilio Phone Numbers to network subscribers in Argentina, including Telefonica. The cause has been identified, the provider is working to resolve the issue, and its next update is due in 16 hours.

_Written by anthropic/claude-haiku-5.5 from Twilio's own updates._

## Updates from Twilio
### 2026-11-05 18:34 UTC: investigating
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to network subscribers in Argentina. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.

### 2026-11-05 19:12 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to Telefonica network subscribers in Argentina. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 1 hour or as soon as more information becomes available.

### 2026-11-05 20:13 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to Telefonica network subscribers in Argentina. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 2 hours or as soon as more information becomes available.

### 2026-11-05 22:15 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to network subscribers in Argentina. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 4 hours or as soon as more information becomes available.

### 2026-11-06 02:21 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to Telefonica network subscribers in Argentina. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 8 hours or as soon as more information becomes available.

### 2026-11-06 10:22 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Phone Numbers to network subscribers in Argentina. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 16 hours or as soon as more information becomes available.

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