Outdialing Prefix Settings 55Outdialing PrefixSettingsA telephone user can look up a call in the call logs (Missed Calls,Answered Calls, and Dialed Calls) using the telephone display panel,select a telephone number from any of the logs, and redial it.To redial a number from the Missed Calls or Answered Calls list, the NBXsystem needs to know the appropriate dial prefix to prepend to the digitsin the telephone number.For information and examples about how to configure outdialingprefixes, see the Help at NBX NetSet > Dial Plans > Operations >Outdialing Prefixes.ManagingExtensionsThis section describes how to add, change, and manage extensions:■ Extension Settings Overview■ Changing Extension Length and Ranges■ How Auto Discovery Assigns Extensions■ Modifying Extensions■ Converting ExtensionsExtension SettingsOverviewThe NBX system establishes connections between extension numbers.The concept of an extension applies to more than just telephones.Extensions are also assigned to NBX applications such as Call Park zones,Auto Attendants, hunt groups, Line Card ports, voice mail ports, andvirtual devices such as the pcXset™ PC soft telephone Client and theConneXtions H.323 Gateway.The extension length (either 3 or 4), which applies to all extensions on asystem, indicates that all extensions contain that number of digits. Youcannot mix 3-digit and 4-digit extensions within the same NBX system.NBX systems support 3-digit and 4-digit dial plans, although there aresome differences in the extension ranges as noted in these tables. Bydefault, the NBX 100 uses a 3-digit dial plan, and the NBX V3000 and theSuperStack 3 NBX use a 4-digit dial plan.Table 8 lists typical extension ranges by type. Table 10 describes theseranges in more detail.
