Extension Schemas

Created by Westvox Support, Modified on Tue, 12 Aug at 10:17 PM by Westvox Support

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.

While 911, 988 (National Suicide Prevention Hotline), and 711 are the only N11 numbers officially reserved in all of North America at this time, we strongly recommend not using any N11 extensions, as popular services like 211, 311, 411, and many others are reserved in most areas of the country.

Schema Considerations

Actually 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.

Example Schemas

Please note, the below is only a list of example ranges and not actually limited or reserved for a corresponding feature/function.

100 - 199	Users extensions
200 - 299	More available extension range (Except 211)
300 - 399	Routing Users / Ring Groups / General Voice Mail etc. (Except 311)
400 - 499	Conference Bridge extensions (Except for 411)
500 - 599	Auto Attendants (Except 511)
600 - 699	Call Queues (Except for 611)
700 - 799	Reserved Space for Parking Functions. Note: System default uses extensions 700-729 only. To extend call parks to 730-799, please send a request to the Control Tower team by emailing support@westvox.com. (Except 711)
800 - 899	Available extension range (Except 811)
1000 - 1999	Users extensions in Building 1
2000 - 2999	Users extensions in Building 2

Reserved Number Space

The following numbers should not be assigned within a domain because they are reserved for system functions.

Customization

The table below provides information about the reserved number's functionality and whether numbers are System Reserved.

Numbers explicitly marked as (Not System Reserved) can be used without custom programming from Westvox, but we do not recommend using those for anything other than their intended purpose.

Reserved Numbers Table

XX	2-digit extensions are not set up on our system by default and are not recommended. (Not System Reserved). Setting up 2-digit extension functionality with custom dial translations is possible for the normal. Still, many system dialing features will not work by default and will require additional fees for further customization. If you choose to use 2-digit extensions as a customization, any new system features added in the future will NOT support 2-digit extensions by default. Future customization fees may be required to enable the features.
0+	Extensions cannot start with the number zero. (Not Allowed). Custom programming is not available for this number space.
011+any number of digits	011 is used to prefix international dialing. (System reserved). Custom programming is not available for this number space.
211	Community Information and Referral Services. (Not system reserved).
311	Non-emergency municipal government services. It is only supported in certain major cities. (Not system reserved).
411	Information Services. (System reserved).
511	Traffic Information or police non-emergency services. (Not system reserved).
611	Customer Service Number. (Not system reserved). You can set up 611 for your customers, allowing them to dial your service desk.
700-729 730-799	Used for Call Parking Queues. (System Reserved). By default, the system uses extensions 700-729. We recommend using the 730-799 range if you need more parking lots. These ranges can also be moved or customized but are subject to fees.
711	TRS (Telecommunications Relay Service) (System Reserved, but not enabled by default). For information about setting up 711 for TRS, see this article.
811	Underground public utility location, aka Call Before You Dig. (System Reserved).
911	Emergency (System Reserved) Custom programming is not available for this number space.
933	911 Test Number (System Reserved) Custom programming is not available for this number space.
988	National Suicide Prevention Hotline (System Reserved) Custom programming is not available for this number space.
999	Account Code feature
5000	Unregistered login to voicemail; the user will be prompted for extension and password. (System Reserved).
5001	Registered login to voicemail; the user is prompted for password only. (System Reserved).
5002	Hot Desk Sign-In. (System Reserved). We recommend using Star codes instead of 5002 and 5004 for Hot Desking.
5003	Pin Number Required Dialing. (System Reserved). After dialing 5003, the user is prompted for the PIN, then provides 2nd dial tone (useful for calling from phones in public spaces)
5004	Hot Desk - Release Device. (System Reserved). We recommend using Star codes instead of 5002 and 5004 for Hot Desking.
7000-7999	Transfer to Voicemail for 3-digit extensions (System Reserved).
8888	This User has a limited view of the PBX portal. The 8888 User can only view the Home and Call History pages when assigned the Office Manager role. Other Office Manager functions are hidden.
70000-79999	Transfer to Voicemail for 4-digit extensions (System Reserved).
99000-99999, 990000-999999	99 prefixed to a 3-digit or 4-digit user extension is used for intercom features. (System Reserved).

Additional Information

In the North American Numbering Plan (NANP), N11 numbers are reserved for various purposes. You should not use N11 extensions for anything other than the descriptions in the table above. With that in mind, Westvox only provisions federally mandated shortcodes.

To set up a local (city/state/community) service number such as 211, 311, or 811, you can set up a routing user with the desired extension with a 'Forward Always' answering rule to send to the appropriate DID or Toll-Free Number.

Contact Center Reserved Number Range

You can reserve a specific range of extensions for the Contact Center on your partner account so that dialing from the PBX will automatically route to the contact center if those extensions are dialed. We recommend changing your contact center default extension range to 8000-8999. If a partner-level dial translation is added, any existing extensions in this range on the PBX will fail to work.