The following information is simply an example of an extension numbering schema. The advantages of adopting a schema for your company will help when you support multiple clients a day, to see the same organizational setup across all of your clients domains.
NOTE: Keep in mind, you should use a 3 or 4 digit extension. Avoid the
Organizationally speaking, you may want to consider if the client has more than one (1) location. When you visit a hotel, or a hospital, typically the first number represents what floor you need, followed by a room number. You could consider this same type of numbering schema to create your extensions 1000's for the first location, and 2000's for the 2nd building or location.
|100 - 199||Users extensions|
|200 - 299||More available extension range|
|300 - 399||Routing Users // General Voice Mail etc.|
|400 - 499||Conference Bridge extensions|
(Except for 411)
|500 - 599||Auto Attendants|
|600 - 699||Call Queues|
(Except for 611)
|700 - 799||Reserved Space for Parking Features|
|800 - 899||Available extension range|
|1000 - 1999||Users extensions in Building 1|
|2000 - 2999||Users extensions in Building 2|
See this article for other Reserved Number spaces.