FERRETTI is an isolated minor planet far from the major space lanes, but the native Ferrettii are said to eagerly welcome any and all visitors.  They apparently believe that their purpose is to "attract anomalous sounds and transmit them to people."  We have this account via a single authenticated interviewer from Takatsuki, whose only reported followup question ("Why?") was answered with an "invincible explanation" that convinced him to return to his Dōmei and search for anomalous sounds.  Transit records show that he has made several subsequent journeys to Ferretti, but has made public no further tales of what happens there.  The rest of the galaxy seems strangely incurious about it.