Voice-transit conductor
A voice-transit conductor was a communications system used on the planet Kataan during the last decades of the planet's life, shortly before its sun went nova.

When Captain Jean-Luc Picard relived Kamin's life in 2368, he wanted to send a message to another community as soon as he awakened in the other man's life. His wife Eline told him that this could be arranged, he had to wait until "tomorrow", however. ()
Communications technology