Media data communication method, system and device and storage medium

The invention provides a media data communication method, system and device and a storage medium, a first end and a second end are arranged in different levels of domains, and the method comprises the following steps: the first end establishes a communication connection with a first media device, and creates a first device switching node communicating with the first media device; the first end sends a channel binding request to a second end, and the second end is configured to create a channel switching node corresponding to the first end after receiving the channel binding request and send a call request to the first end; when the first end receives the calling request, creating a proxy switching node communicating with the first equipment switching node and the channel switching node; and the proxy switching node sends the first media equipment data received by the first equipment switching node to the channel switching node of the second end. By adopting the method and the device, the dynamic cross-domain