For phase 1, only 2 users can video / audio chat at the same time in Crugo. This will eventually be developed to allow multiple user video / audio chat.
User A goes to the direct tag of User B and presses the call button. User A is presenting with a calling UI. User B received that call and is shown the being called UI. User B Then presses answer. At this stage both User A and User B are taken into the video chat UI. WebRTC does its thing and the call is initialised.