# SIP US Maintenance

- Provider: [Vapi](https://down.guide/vapi)
- Level: confirmed
- Impact: Maintenance
- lasted 10m
- started 2026-09-21 05:00 UTC
- Vapi SIP, Vapi Numbers Inbound, Vapi Numbers Outbound +2
- us
- id: DWN-de03ece195
- Official page: https://status.vapi.ai/incidents/1064531

## Updates from Vapi
### 2026-09-21 05:00 UTC: update
We are performing maintenance on our SIP infrastructure to improve monitoring and stability. This will result in ~1min downtime.
Who is affected: Calls using Vapi numbers, SIP (sip.vapi.ai), or a BYO SIP trunk will be unable to connect during the maintenance.
Who is not affected: Calls using a native Twilio, Telnyx, or Vonage number connected directly, web callers, or users in the Vapi EU or AUS regions.
When: September 20, 2026, 10:00pm to 10:10pm PT
What to expect: SIP calls will fail to connect for about 1 minute at 10:00pm PT and return the standard error response. We will then validate for the rest of the window while calls connect normally.
Action needed: If one minute of failed calls is a concern, route through an alternate transport such as Twilio for the window.
We will update this page when calls are connecting again and when the work is complete.

### 2026-09-21 05:10 UTC: update
Maintenance ended

### 2026-09-21 06:12 UTC: update
Due to operational delays, the maintenance occurred at 10:50pm PT. We observed a decrease in the rate of outbound dials that returned to normal levels at 10:58pm PT. No on-going calls would have been impacted.

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