In one embodiment, a system for conducting a conference session among a group of participants includes a server for establishing communication channels over a network connected with endpoint devices of the participants. The server operates to allocate initial resources on the network to conduct the conference session, the initial resources including the communication channels and at least one conferencing bridge. Code running on the server selects one or more different resources currently available during the conference session. The one or more different resources is selected to optimize a quality of service (QoS) criteria. Execution of the code causes the server to move the conference session to the one or more different resources responsive to a triggering event. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.