https://youtu.be/jKSW8GEe5Bk
This is done by a guy in Canada, who made a great explinaition with slo motion on how the phone call is made using a Three Slot payphone.
Check it out if you've been wondering all that happens when you made a phone call from a pay phone.
Though this is primarily a Three slot, the same basic principles apply to a Single Slot, with exception to Bells and Chimes being replaced by Tones and the speeds of those Tones.
It's an excellent explanatory video part 2 of a two part series. He has other great videos of telephone functions in the central office to the telephone set