Jul '25 • 🛠️ dev-help
🚨 Outbound Call Error in Vapi – “call.in-progress.error-sip-outbound-call-failed-to-connect”
Hey everyone,I’m currently building an AI Calling Agent using n8n and Vapi to call leads automatically. I'm using a free Vapi US number, and I'm trying to make outbound calls within the US only.
However, every time I trigger a call via the HTTP request, I get this issue:
- Initial status: queued
- After a few seconds, the call fails with:Status: endedReason: call.in-progress.error-sip-outbound-call-failed-to-connect
I've already:
- Linked the free number to my assistant
- Added a working script to the agent
- Made sure the phone number I'm calling is valid (US-based mobile)
- Set up everything correctly in n8n and the request payload
Still, all outbound calls are failing with this SIP error.
👉 Has anyone faced this issue before?👉 Do free Vapi numbers support outbound calls reliably?👉 Would using a Twilio number via SIP resolve this?
Any help or insights would be appreciated 🙏Thanks in advance!
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🚨 Outbound Call Error in Vapi – “call.in-progress.error-sip-outbound-call-failed-to-connect”
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