Reply To: 19 Jul 17 – Google Home Gets Free US & Canada Phone Calls
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These days the ringing signal a caller hears is generated locally.
In the olden days, there was an audio path between the caller and the destination phone, even before that phone was picked up, and the ring the caller heard was actually from the ring signal to the called telephone.
These days, there is no path for audio until the connection has been established. The ring signal, busy, or reorder signals are a product of the originating switch, based on digital information passed back via the connection between the telephone switches.
And, when is the last time you have heard a busy signal, or a reorder signal? I think they have been phased out, at least for the reorder signal. And, almost everyone runs with either call-waiting or voice mail these days, and those rule out a busy signal.