In one implementation, two or more endpoints or client devices communication uses a peer-to-peer, browser based, real time communication protocol. One example of such a protocol is Web Real-Time Communication (WebRTC). An intermediary device receives from a first endpoint, a request for communication with a second endpoint, using the browser based real time communication. The intermediary device identifies a control protocol based on the request for communication, and receives one or more write keys from the first endpoint. The intermediary device monitors communication between the first endpoint and the second endpoint using the one or more write keys. Examples for the intermediary devices include servers, firewalls, and other network devices.