The line's busy.

Once,a telephone operator used to connect lines whenever people called someone.And if the receiver was occupied by the other caller, then the operator would said"The line's busy".Off course.now such a thing is not done.

 "This line is busy"seems difficult to be translated into Japanese. Once Japanese American operators often said from US to Japan in Japanese"Sen ga isogasi( The line works hard at it)"This"busy"means "occupied".It was one of strange Japanese phrases.
(This photo was taken at AT&T office in early70's )