A media appliance comprising: video apparatus for outputting signals to a screen; a network interface for accessing a packet-based network; a memory storing a communication client application; and processing apparatus arranged to execute the communication client application. The client application is configured to allow a local user of the media appliance to participate in bidirectional communication sessions with other remote users via the network interface and packet-based network. The client application is further configured so as: to receive an invitation signal from a remote user terminal over the packet-based network, the received invitation signal comprising a trigger condition specifying a future event for triggering participation of the media appliance in a proposed one of said communication sessions with said remote user terminal; to monitor the received trigger condition at said media appliance; and to join the proposed session in dependence on an occurrence of said event.