A data processing method comprising generating, by each Interactive Connectivity Establishment (ICE) endpoint of a plurality of ICE endpoints, a username comprising an identifier, wherein the plurality of ICE endpoints are accessible through a single Internet Protocol (IP) address and port number pair; sending, by each ICE endpoint, at least the username to a server for use in establishing a session between a specific ICE endpoint of the plurality of ICE endpoints and a client device; receiving, at a proxy associated with the plurality of ICE endpoints, a datagram from the client device for the specific ICE endpoint, wherein the datagram comprises the username; in response to attributes of the datagram not matching an entry in a table of the proxy, extracting the identifier from the username; forwarding, by the proxy, the datagram to the specific ICE endpoint based on the identifier.