User guide

System Administrator’s Guide – Release 7.5
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Revised: April 9, 2013
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7 Internal Dial Plan and Extension Length
The extension length setting configures extensions to be either three (3) digits or four
(4) digits long. This capability influences other server features and has some
limitations that are discussed below.
The Internal Dial Plan specifies the first digit for user extensions and other PBX
functions such as forwarding calls and accessing outside lines. The dial plan can be
configured to meet the needs of the customer by:
• Matching extensions to DID numbers
• Keeping extensions the same as they were prior to the introduction of the Allworx
system
• Changing the PBX outside line access to a digit other than “9” to avoid accidental
911 calls
• Both extension length and the internal dial plan affect many of the system’s
features. For this reason, it is recommended to make these decisions and
configure the options early in the installation process.
7.1 3-Digit vs. 4-Digit Extensions
7.1.1 Setting Extension Length
New Allworx servers are factory-configured for 3-digit extensions. If using 3-digit
extensions there are no configuration changes. If using 4-digit extensions, Allworx
recommends changing the extension length to four digits before defining any Users,
Handsets, or Extensions. Change the extension length using the following procedure:
1. Login the server.
2. Navigate to Phone System > Dial Plan.
3. Locate the Internal Extension Length section, and click the Modify link.
4. Change the User and System Extensions to 4 digits in length.
5. Click Update to save the configuration.
6. Reboot any previously configured handsets. 0.
Note: Extension Length cannot be changed on a system that is part of a Multi-site
network.
7.1.2 Extension Length Changes on Existing Systems
When an existing server with 3-digit extensions is switched to 4-digit extensions, the
user and system extensions will automatically change to four digits. The server will add
a one (1) to the start of each extension. For example, if a user had the extension x104,