Foxes are quite vocal animals, capable of creating a number of noises. Vocalizations are used for a variety of purposes and twenty-eight unique types have been documented. They can be used for interactions with other foxes that are close or far away. Though vocalizations are so useful, it isn't the foxes' only method of communication. They also use visual interaction, such as facial expressions, and all sorts of scent marking.
Source is Animal Diversity Web. Video is from YouTube.