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It's called an off hook tone. Or you can call it a receiver off hook tone or r.o.h. tone or a permanent signal.

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12y ago

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What is an off hook circuit?

It is terminology used in the telephone industry in regards to when a telephone circuit is activated when the handset has been lifted from the cradle or off hook. Off hook comes from when telephones had separate receivers that you put to your ear to listen. It was hung on a hook device on the side of the telephone. The mouth piece was fixed stationary on the front face of the telephone and the whole telephone was mounted on the wall.


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