This usually indicates Twilio can’t successfully reach or process the webhook, which matches the 11200 HTTP Retrieval Failure. Even if the URL is correct, issues like SSL/TLS validation, incorrect response format, timeouts, or missing headers can cause Twilio to fail before the call is handed to Vapi. I can help test the webhook endpoint, inspect Twilio request/response logs, and ensure the endpoint returns a valid, fast 200 response so calls are properly routed to the assistant. @Imd_93dz