Video Stream before answering the call

Hi folks,

i am programming a door intercom system with asterisk and raspberry. The backend works fine.
But I have a question with asterisk and video calls.
Usually, the video stream starts after answering the call. Is it possible to start the video stream to all clients direct after starting the call? Because I want to see, who is standing at the door, before I answer the call and speak with him.

Thank’s a lot.

I am pretty sure that video is not supported as early media. Also, there is a hint that you are using & in your dial strings. That disables a lot of early media.

This always assumes that the device itself supports early video media.