After a push has arrived to ring (apn/fcm/huawei), and the user wants to pick up the phone, it is necessary to send this request so that all other devices receive a push via web socket, indicating that the call is answered. After answering, the call status changes to answered.
POST /api/v1/intercom/calls/{call}/start
Parameters
intcall, ID of the call to start (status should be ring)