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Hotline

A hotline is a point-to-point communications link in which a call is automatically directed to the preselected destination without any additional action by the user when the end instrument goes off-hook. an example would be a phone that automatically connects to emergency services on picking up the receiver. therefore, dedicated hotline phones don't need a rotary dial or keypad. there are also hotlines between states with nuclear weapons, like the moscow–washington hotline.