Rob and Kev record their entire conversation about "The Sehlat Who Ate Its Tail" (SNW) over copper wires with pink telephone receivers. They then visit two previous uses of "ancient" technology in Trek adventures, "Spectre of the Gun" (TOS) and "Vis à Vis" (VOY).
SNW 3×06 The Sehlat Who Ate Its Tail
TOS 2×18 Obsession (the tragedy where Kirk, as a Lieutenant, blamed himself for the deaths of half the Farragut crew)
“Risk is our business” (and an extended cut!)
SNW 2×06 Lost in Translation (clip of Kirk/Spock/Uhura first drink)
Using Ancient Technology
TOS 3×06 Spectre of the Gun
VOY 4×20 Vis à Vis
VOY 2×15 Threshold
VOY 6×05 Alice