Callinon VII was the unhabited seventh planet in the Callinon system. This system was located inside Dominion space in the Gamma Quadrant. On the planet's surface, there was an unmanned subspace relay station. The Karemma were instructed by the Dominion to direct all inquiries to this station.
During their search for the Founders in 2371, Jadzia Dax and Miles O'Brien transported to the station from the USS Defiant. They became trapped when a shield was raised around the outpost, and the Defiant was forced to leave them behind when Jem'Hadar forces appeared in the system. (DS9: "The Search, Part I")