CONFERENCING SERVER

A conferencing server is directly accessible from the public Internet and has a host transport address, which is a combination of a public IP address on the public Internet and an associated port. It comprises conference hosting logic for hosting at least one conference, in which media data is transmitted and received via the conferencing server between participant endpoints; media processing logic configured to process received media data of the conference for transmission in the conference; multiplexing control logic configured to determine a plurality of multiplexing tokens to be used by the participant endpoints; and demultiplexing logic configured to identify received multiplexing tokens in transport layer payload data of a sequence data packets received from the participant endpoints at the host transport address, and use the multiplexing tokens identified in the transport layer payload data to demultiplex the data packets for processing by the media processing logic.