A computer-implemented method of implementing floor control in a conferencing session, the method comprising: receiving, by one or more computing devices, a radio resource presence message from a radio gateway, the radio resource presence message indicating an entry of one or more radio endpoints into the conferencing session, wherein the one or more radio endpoints communicate using only half-duplex communication techniques, and are incapable of communicating using full-duplex communication techniques, wherein the conferencing session is associated with a conferencing system comprising a plurality of endpoints, and wherein at least one of the endpoints in the conferencing system is a full-duplex endpoint capable of communicating in the conferencing session using full-duplex communication techniques, and wherein the radio resource presence message is received while the conferencing session is operating in a full-duplex mode wherein each endpoint is communicating in the conferencing session using full-duplex communication techniques; in response to receiving the radio resource presence message, switching, by the one or more computing devices, the conferencing session from the full-duplex mode to a push-to-talk mode; receiving , by the one or more computing devices, a transmission capabilities request from a first endpoint of the conferencing session; granting , by the one or more computing devices, transmission capabilities to the first endpoint based at least in part on one or more floor control parameters associated with the conferencing session; and subsequent to granting transmission capabilities to the first endpoint, providing , by the one or more computing devices, audio data from the first endpoint to at least one endpoint of the plurality of endpoints. receiving, by one or more computing devices, a radio resource presence message from a radio gateway, the radio resource presence message indicating an entry of one or more radio endpoints into the conferencing session, wherein the one or more radio endpoints communicate using only half-duplex communication techniques, and are incapable of communicating using full-duplex communication techniques, wherein the conferencing session is associated with a conferencing system comprising a plurality of endpoints, and wherein at least one of the endpoints in the conferencing system is a full-duplex endpoint capable of communicating in the conferencing session using full-duplex communication techniques, and wherein the radio resource presence message is received while the conferencing session is operating in a full-duplex mode wherein each endpoint is communicating in the conferencing session using full-duplex communication techniques; in response to receiving the radio resource presence message, switching, by the one or more computing devices, the conferencing session from the full-duplex mode to a push-to-talk mode; receiving , by the one or more computing devices, a transmission capabilities request from a first endpoint of the conferencing session; granting , by the one or more computing devices, transmission capabilities to the first endpoint based at least in part on one or more floor control parameters associated with the conferencing session; and subsequent to granting transmission capabilities to the first endpoint, providing , by the one or more computing devices, audio data from the first endpoint to at least one endpoint of the plurality of endpoints. <EOS>