62 CHAPTER 2: D IAL P LANChanging ExtensionsYou can perform several operations through the Modify Extensions dialogbox (Table 11). This section describes several examples.Example: If you select Change Extension from the Operation list, thesystem replaces the selected extension with the number you type in thetext box.Example: If you select Strip Leading Digits from the Operation list, andtype the number 2 in the text box, the system strips (removes) two digitsfrom the beginning of the extension.Example: If you select extensions 1000 through 1009 and select StripTrailing Digits from the Operation list, the system does not make anychange, because the result is a series of identical numbers (all 100).ConvertingExtensionsThe Convert Extensions feature enables you to use the NBX NetSet utilityto quickly change these extension types from 3-digits to 4-digits or from4-digits to 3-digits.■ Virtual Tie Line (VTL) extensions■ Voice mail port extensions■ Call Park extensions■ Paging extensionsThe Convert Extensions feature helps you in the larger task of convertinga dial plan between 3- and 4-digits. To perform a complete a dial planconversion, you must also manually convert any existing extensions forthese extension types:■ External extensions (Analog Line Card ports, Analog Terminal Cardports, and Digital Line Card channels extensions)■ Internal extensions, which includes TAPI Route Point extensions■ H323 Gateway extensions■ Hunt Group and Automatic Call Distribution Group extensionsStrip Trailing Digits Strips (removes) the specified number of digits from the endof all selected extensions.Table 11 Modify Extension Operations (continued)Operation Purpose
