Providing announcements for communication sessions includes facilitating the communication sessions among endpoints comprising a half-duplex push-to-talk endpoint. It is established that a trigger event has occurred at the half-duplex push-to-talk endpoint, where the trigger event indicates an activity status of the half-duplex push-to-talk endpoint. One or more announcements associated with the trigger event are identified. The one or more announcements are provided to at least a subset of the endpoints.