A conference system provides a routing table that specifies which sinks are connected to which sources. When the conference system receives the content from the video source, it routes the content to the video sink. When the conference type is full mix, the hub computer system is responsible for mixing the content received from the various endpoints and sending the mixed content to the endpoints. When the conference system receives content from various endpoints, it determines which sinks are to receive content from which sources based on the routing table. For each unique combination of sources that a sink is to receive, the conference system mixes the content from that unique combination of sources. The conference system then sends the mixed content to the sinks that are to receive that unique combination. The conference system generates a routing table that identifies the connections between the sinks and sources of a conference to track the unique combinations.