Abstract: A dynamic video communications system provides real time provisioning of a video communication session in a domain video network between a set of user devices. The real time provisioning is implemented by receiving an identifier of a video communication session from a user device, where the identifier includes a domain and a name, determining an authentication principle associated with the user device, where the authentication principle includes a domain of the user, checking whether the domain of the user matches a domain of the video communication session, and joining the user device with the video communication session.