What does “ring off” mean?

to put down the telephone because you have finished speaking

How is “ring off” used?

In The Life and Death of Colonel Blimp (1943), one line is: “I must ring off now. Good luck to you all.”

The clip at the top of this page is from The Life and Death of Colonel Blimp (1943).

I must ring off now. Good luck to you all.

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