Hi! The 404 is happening because that URL isn’t the correct inbound endpoint for Vapi.
For incoming calls, you should set your Twilio Voice webhook to:
https://api.vapi.ai/twilio/inbound_call
The /twilio/voice?assistant=ID pattern is typically not used for inbound routing, which is why you’re getting a 404. Also make sure your assistant is properly linked to the number in Vapi, otherwise Twilio will hit the endpoint but won’t know how to route the call.
If you want, I can quickly help you verify your full setup and debug it end-to-end.
@ibstyln