288 CHAPTER 11: DIAL PLANModifying Extensions You can modify the extension number of any device in the system.Normally, you make changes only after you have changed the extensionranges for the system, to align the extensions with the new ranges.CAUTION: Be careful when you change extensions. The system does notvalidate changes that you make, and there is no Undo or Cancel function.A mistake can compromise the operation of the system.To modify extensions:1 Click Dial Plan > Configure.2 Click the Modify Extensions tab.3 Select the extension, or extensions, that you want to modify. To select allextensions, enable the Select check box.4 Select an operation from the drop-down list and make the appropriateentries in the field, which display after the member list:■ Change Extension — Modifies the first selected extension with thenumber you type in the field next to the drop-down list. ChangeExtension applies to only one extension at a time. If you select multipleextensions, the system changes only the first extension that youselected.■ Prepend — Prepends digits in front of all selected extensions.■ Append — Appends digits to the end of all selected extensions.■ Strip Leading Digits — Strips (removes) the specified number ofdigits from the beginning of all selected extensions. For example, ifyou type the number 2 in the field, the system strips (removes) twodigits from the beginning of the extension.■ Strip Trailing Digits — Strips (removes) the specified number ofdigits from the end of all selected extensions.Click Apply to make thechanges, or click Reset to restore the settings to their original status.If the requested change creates a duplicate extension or an extension ofzero length, the system discards the change. For example, if you selectextensions 1000 through 1009 and select Strip Trailing Digits, the systemmakes no change, because the result is a series of identical numbers (all100).ConvertingExtensionsThe Convert Extensions feature enables you to use the NBX NetSet utilityto change these extension types from 3-digits to 4-digits or from 4-digitsto 3-digits quickly:
