A conferencing computing device, including memory storing one or more dispatch data structures. The conferencing computing device may further include a processor configured to receive a plurality of input packets at a port from a plurality of sender computing devices. Based on input packet data and the one or more dispatch data structures, for each input packet, the processor may to add that input packet to a queue of a transport provider bound to the port. The processor may transmit the plurality of input packets to a plurality of application program instances and instantiate a respective plurality of concurrent multipoint conferencing sessions. The processor may transmit a plurality of output packets from the plurality of application program instances to a plurality of recipient computing devices. The plurality of output packets may be multiplexed through the port and each have a multiplexed local socket address of the port.