Δαφνη Ευτυχια Αρθουρος

[1963-08-20: The Washington-Moscow Direct Communications Link (aka the Moscow-Washington hotline or "the red phone") was established and the first test message was sent over it.]

History.com:

"An article in The New York Times described how the new system would work: Kennedy would relay a message to the Pentagon via phone, which would be immediately typed into a teletype machine by operators at the Pentagon, encrypted and fed into a transmitter. The message could reach the Kremlin within minutes, as opposed to hours. Although a far cry from the instantaneous communication made possible by today's cell phones and email, the technology implemented in 1963 was considered revolutionary and much more reliable and less prone to interception than a regular trans-Atlantic phone call, which had to be bounced between several countries before it reached the Kremlin."

[The Wikipedia page for the hotline has some interesting tidbits.]