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• 21:45, 17 February 2025 Sarah talk contribs created page Ringing machine (Created page with "A '''ringing machine''' is a motor generator set that was used by telephone companies to create the current needed to ring the bells in subscriber's telephones (referred to as ''machine ringing''), and to create the call progress tones that a subscriber might hear while making a call. These sounds usually include dial tone, ringback tone (known as ''audible ringing'') or busy tone. == Origins == The origins of the ringing machine date back to hand cranked magnetos used...") Tag: Visual edit