Yep even explaining what happens to give you a dial tone on a landline is pretty crazy when you first look into it. It surprises many people to learn that the

Yep even explaining what happens to give you a dial tone on a landline is pretty crazy when you first look into it. It surprises many people to learn that the tone isn’t “always there” and that signalling happens with the exchange to create it. This includes checking billing status and other things. These systems are so robust we mostly take them for granted.