Telephone Plans

So let's say you're sitting here in Las Vegas and you're trying to make a call to Boston, using something called the North American Dialing Plan Mitel Systems, the North American Dialing Plan is basically like a routing protocol if you're thinking about routers. NADP, you can Google it, we'll put a little resource at the bottom.

Basically, this is the routing protocol for the telephone system. When you're sitting at your building and you make a call to Boston, it looks at that telephone number and depending on the area code and other things that are in that telephone number, it can then route that call to Boston, or if you're trying to call Atlanta. It then will route through these central offices or through something called trunk lines over to Atlanta. That's what central offices are.

The PSTN is a public switch telephone network. Think of this as the Internet for telephone systems basically. Everybody connects to the telephone system through a central office, so you always have a central office.

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