Twilio issue help me

Questions
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1

I tried to connect twilio and retell. I m able to get call from twilio.But in the call it is telling ," we are sorry application error occured in the call".Please help me to resolve

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Hi @Mayur_Kaarthic Welcome to the n8n community!

It looks like the “application error” is happening because Twilio can’t reach your n8n webhook. Since you’re running n8n on localhost, Twilio and Retell (both on the public internet) cannot access URLs like http://localhost:5678/``..., which leads to the error you’re hearing.

How to fix it:

  1. Expose your local n8n using a tunnel
    Use ngrok or Cloudflare Tunnel to get a public HTTPS URL that forwards to your local n8n.

  2. Start n8n with the public URL
    Set WEBHOOK_URL="https://your-ngrok-url" when starting n8n so it generates proper public webhook links.

  3. Update Twilio & Retell
    Replace any localhost URLs in Twilio/Retell with your new public HTTPS URL.

  4. Test the webhook
    Open the public webhook URL in your browser, if you can’t reach it, Twilio can’t either.

  5. Check n8n’s Executions tab
    If the URL works but the workflow still errors, one of your nodes may be failing.

If you can share your Twilio webhook settings and the n8n Webhook node’s production URL (sanitized), we can help you confirm the exact cause.