1. Tangible, non-transitory computer-readable media having instructions encoded thereon, wherein the instructions, when executed by one or more processors, cause a network microphone device of a networked microphone system to perform a method comprising: establishing a metadata exchange channel between a media playback system and the networked microphone system, wherein the network microphone device and the media playback system are on a local area network; obtaining from the media playback system via the metadata exchange channel, metadata associated with the media playback system; receiving a voice input comprising a context-specific request corresponding to media played back by the media playback system; and in response to receiving the voice input, transmitting to a network microphone server of the networked microphone system, a request based on (i) the voice input and (ii) the metadata associated with the media playback system.