Video conferencing setup is a superset of what we have seen for audio conferencing. Actually both audio and video conferencing configurations are read by the same mod_conference module.

Audio only callers can join video conferences, for example from PSTN (obviously they will only be able to listen and speak to the conference, they will not send or receive video streams). SIP callers can join with video, too, particularly from softphones and communication apps. But the queens and kings of FreeSWITCH videoconferences are the WebRTC clients, and between them the VERTO clients, that are able to tap into a series of advanced interactive functionalities. The Empress, the Khaleesi of VERTO clients is Verto Communicator, our flagship conferencing client for WebRTC browsers. We'll learn more about her later.

A fully configured FreeSWITCH video conference, with all the special VERTO features enabled, is also a perfectly legit audio conference, and if no caller ever joins that has video capabilities, that conference is indistinguishable from an audio only conference, no video streams will be created and no additional CPU will be used.