A computer implemented method comprises transmitting initial signaling data for a video conference from a signaling server to a plurality of client computing devices, the initial signaling data omitting identifiers for media data, establishing, by a media server, the video conference with the plurality of client computing devices, the plurality of client computing devices having used the initial signaling data to connect to the media server, sending, by the media server, media data for a subset of the plurality of client computing devices to the plurality of client computing devices, sending, by the media server, identifiers of the media data to the plurality of client computing devices.