This web app is intended to receive incoming WhatsApp API calls.
When a call arrives, either of 2 options can be taken based on configuration:
1. A modal will appear allowing you to accept or reject it.
2. The call will be automatically accepted.
Once accepted, a WebRTC connection is established between your browser and the WhatsApp user,
enabling real-time two-way audio communication using Ultravox.
Click "Terminate Call" to end the call at any time.