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Ringing machine: Revision history

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20 February 2025

19 February 2025

18 February 2025

17 February 2025

  • curprev 21:4521:45, 17 February 2025 Sarah talk contribs 1,272 bytes +1,272 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
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