I'm sorry to hear about the issues during your demo. That must have been frustrating! To help troubleshoot these call failures more effectively, could you please provide some additional information:
1. What type of phone system are you using with Vapi (Twilio, SIP, Google Voice, etc.)?
2. Have you made any recent changes to your assistant configuration or telephony settings before the demo?
3. When you say the assistant "immediately hangs up," does it hang up before saying anything at all, or does it speak briefly and then disconnect?
4. Are you seeing any specific error messages in the dashboard (even if the call logs aren't fully loading)?
5. Have you tried making test calls after the demo, and if so, are you still experiencing the same issues?
I'll look into those specific Call IDs you provided, but this additional context will help me provide more targeted troubleshooting steps.