A data processing method comprising receiving, at a proxy associated with a plurality of ICE endpoint computers, a datagram from a client computer for a specific ICE endpoint computer of the plurality of ICE endpoint computers, wherein the datagram comprises a username generated by the specific ICE endpoint computer, and wherein the username has been sent to a server computer by the specific ICE endpoint computer for use in establishing a session between the specific ICE endpoint computer and the client computer, in response to attributes of the datagram not matching an entry in a table of the proxy, extracting an identifier from the username, forwarding, by the proxy, the datagram to the specific ICE endpoint based on the identifier.