@_hate_ter_ It sounds like there might be a configuration issue with your Twilio number or with the webhook setup for your VAPI.ai Assistant. Let's go through a few steps to ensure everything is set up correctly: 1. **Twilio Number Configuration**: Verify that your German Twilio number is correctly configured in your Twilio console. Ensure that the number is active and that there are no restrictions that might be causing the issue. 2. **Webhook URL**: Double-check the webhook URL you've set for inbound calls in your Twilio voice configuration. It should exactly match the endpoint provided by VAPI.ai for handling inbound calls. 3. **Assistant Connection**: Confirm that your VAPI.ai Assistant is properly connected to your Twilio number and that the inbound settings are correct. Since you mentioned there's no fallback destination, ensure that this is intentional and that your assistant is designed to handle all calls without needing a fallback. 4. **Region Settings**: Although your Twilio number is German, the region is set to US. This should not typically affect the functionality, but it's worth checking if there are any region-specific settings or restrictions that need to be addressed. 5. **Trial Account Limitations**: Since you're using a Twilio trial account, there may be limitations on what you can do with your number. Ensure that you've verified any required information and that your account is in good standing to make and receive calls. If you've checked all these details and the issue persists, it might be necessary to look into the logs for both Twilio and VAPI.ai to identify any errors during the call setup process. If you're unable to resolve the issue with these steps, please reach out to support for more in-depth troubleshooting.

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He faced a similar issue

Then the issue that your using a german number in the US

change the routing to go via Ireland

Once you load the ireland, set up your webhooks the same as per your US set up in Twilio