Embodiments are provided for establishing a simple and secure way to allow a user using a mobile device to control a media playback system without having direct access to the secure local network that the playback system is using. The media playback system may include one or more playback devices synchronously rendering media content. A user of the mobile device may obtain a system identifier of the playback system that is then sent to a remote server via a cellular network. The remote server, which is in communication with one or more media playback systems, may use the system identifier to recognize the correct media playback system and provide the mobile device with configuration information of the media playback system. Subsequently, the mobile device may use the given information to join the media playback system and control one or more features of the media playback system via a cellular network.