How does telephone ringing work?
19:03
The Machine that Makes Your Phone Ring
17:32
2600? How Phreaking Really Worked
13:00
Sender Test Frame: My new circuit works!
24:04
Got a dime? 🪙 How Payphones Actually Work!
31:12
Full Mechanical: The Panel Telephone Switch
14:27
BIG Museum Telephone Exchange Rundown - Telephone Tuesdays
26:27
The 5XB Trouble Recorder
18:10