Em Adespoton (792954)
writes "Before the VirnetX case, nearly all FaceTime calls were done through a system of direct communication. Essentially, Apple would verify that both parties had valid FaceTime accounts and then allow their two devices to speak directly to each other over the Internet, without any intermediary or "relay" servers. However, a small number of calls—5 to 10 percent, according to an Apple engineer who testified at trial—were routed through "relay servers."
At the August 15 hearing, a VirnetX lawyer stated that Apple had logged "over half a million calls" complaining about the quality of FaceTime [since disabling direct connections]."Link to Original Source