SIP US Maintenance

What to do

• Check whether you use Vapi Vapi SIP, Vapi Numbers Inbound, Vapi Numbers Outbound, SIP Inbound and 1 more in us. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Check that everything you run on Vapi came back after the window closed 2026-09-21 05:10 UTC.

• Subscribe to Vapi's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=vapi works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Vapi 3

1. updateSep 21, 2026, 5:00 AM UTC

   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.

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2. updateSep 21, 2026, 5:10 AM UTC

   Maintenance ended

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3. updateSep 21, 2026, 6:12 AM UTC

   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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Corrections

None so far.

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