Hot Line (US title: The Day the Hot Line Got Hot, French: Le Rouble à deux faces or Le Téléphone rouge) is a 1968 Comedy spy thriller directed by Etienne Périer and starring Robert Taylor and Charles Boyer.
An American and Russian agent find themselves duped by a double agent who works for both of them. Also involved are a naive IBM computer operator, and the telephone operator at the hot-line center in Stockholm.