I want to allow my app to : View all Live / ongoing calls Monitor Live call "listen to the live call" from the list of ongoing calls. if the user wants to join in on the call then he can click “join call” (conference via websocket) . Users can choose to remove Assistant from the call if its merged via the websocket. Users can also monitor the call by seeing the live dialog text of the live call . Users can send messages to the AI handling the call, for example: “remind harry about the past due bill of $50.00” Please recommend the Endpoints to use For each query

For monitor live call and send messages to ongoing call check live call control https://docs.vapi.ai/calls/call-features

I wanted to know how i can tell when calls are active in the first place. Then i can listen to a live call .

you have to manage it by yourself by storing the call status if is in progress.

can vapi give the in progress status? like hang up is there

raise the request iover here: https://vapi.canny.io