Home numbering plan

[5415551212]

Greetings everyone I have been thinking about dial plans for home PBX's for the phone collector. People almost always start out collecting a few phones,
then end up in situation where you want to connect the phones to something to demonstrate them, make them ring even put them to their intended use.

I have been messing around with a old NEC PBX system, For anyone that has lots of phones I highly recommend finding any one of these early 2000's systems that are being thrown in the dumpster or taken to e-waste. Someone may literally pay you to remove it from their building.
Then you might find the PBX systems start to multiply.
I see others on here have gotten into Asterisk and other PBX systems
So now that I am finally getting all my phones connected to a few different systems
I realized I did not have a good dial plan.

After putting some thought into it here is what I came up with, Give each room in your house (or building) a single digit room code,
You might have something like this example;
1 = Living room
2 = Primary Bedroom
3 = Kitchen
4 = Craft room
5 = Payphone / phones outside
6 = Bedroom 2
7 = Basement
8 = Library
9 = Garage

(if you have more than 10 rooms/ outbuildings you'll need another plan)

Next adopt a 3 digit dial plan, even if you only have 2 phones and a PBX:
First digit is the technology 
1= Strictly Analog provides battery voltage, connects to analog lines.
2=Digital phones, Merlin, NEC, or IP phones  not real 'phones'.

So any jack labeled in the 100's I know I can plug a 500 set into.
Any jack labeled in the 200's is a digital phone. You might have a digital jack for the one phone used to program your Panasonic or NEC system. Or you might have a complete Merlin system.

2nd digit is the room code
Single digit room code you picked eirler.
1 = Living room
2 = Primary Bedroom
3 = Kitchen
...
and so on

last digit is the line / phone or group of phones
Each room effectively has 10 lines,
Now obviously you might have more than 10 phones in a room, because after all we collect phones here, so you so you may want to group phones by color or type
In our example extension 111 would ring the first group of phones in the livingroom.
Livingroom phone lines would be 111,112,113,114 ...
Library line would be 181, 182, 183  ... an so on
280 would be a digital phone in the library

Now of course I did not think of this before I got my system working so even if you only have one or two phones on your home PBX program it for expansion. As phones tend to multiply.

The room codes make it simple to label cables also. If you have more than one cable to a room you can use letters
Cable 1a and 1b = livingroom, 3 = kitchen  etc.
 

[poplar1]

On a typical PBX, dialing

 9 gives you access to the main outgoing trunk group.

 0 reaches he onsite attendant

This leaves 1 through 8 for the initial digit of a 2-, 3-,or 4-digit line number.

The Western Electric 756A Crossbar PBX, which has a maximum of 10 trunks and 60 lines,  absorbs(ignores) 1- when dialed as the initial digit, and PBX dial tone remains on the line until a different initial digit is dialed.. Thus, the maximum 60 line  numbers are 20, 21, 22,..., 69.

In the U.S., all PBXs for public use are now required to reach 911 by dialing  simply "9-1-1." This bypasses the usual PBX dialing plan, which would require 9-9-1-1. Young children are taught to "dial 911" in case of an emergeny, but this has previously resulted in tragic delays from a hotel room phone, because the dialing plan required 9-9-1-1.

On the TV series "Dr. Kildare", the doctor once told a hospital visitor, "Dial 9 for an outside line." That was the first time I heard of it.