3Com SuperStack 3 NBX Administrator's Manual page 66

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HAPTER IAL LAN
6 If you want calls to cycle through the extensions in the list, check the
Cycle Extensions checkbox. Each time the system accesses the extension
list, it uses the next extension in the list. Calls effectively progress through
the list to balance the load of calls. If Cycle Extensions is not checked, the
extension selection always starts from the top of the list.
If an extension in the list has a higher priority, the highest priority
extension is used regardless of the Cycle Extension setting.
7 To move an extension from Extensions not in List to Extensions in List,
select the extension and click <<.
Use Shift-click to select a block of extensions, and Ctrl-click to select
several extensions in different locations in the list.
8 To change the priority of extensions:
a Select the extension from the Extensions in List scroll list.
b Enter a priority number in the text box below the list (from a high
of 1 through a low of 99).
c Click the Change Priority in List button.
The new priority appears as the number to the left of the item within
square brackets. The default value is 50. When the system accesses an
extension list, it first attempts to use the highest priority extension.
9 Click OK to enable your changes and leave the dialog box.
Example: If the extension list contains extensions that are assigned to
T1 channels, you can assign unique priorities to each extension. If you
instruct the system to place an outgoing call using the T1 line, it attempts
to use the highest priority extension/channel first, and, if the first is
unavailable, tries the next highest priority extension/channel, and so on.
Priorities range from 1 (highest) through 99 (lowest).
CAUTION: If you add an extension list, you must change the dial plan
configuration file to create a destination route to the new list. This
arrangement enables the system to route calls to the new list.