In most corporate environments, the telephone network is configured so that you can reach a destination by dialing only a portion of the full telephone number. You can define an extension number as the destination pattern for a dial peer.
A number expansion set is all number expansions configured on a gateway.
Adding a number expansion set enables you to define a set of digits for the router to add to the beginning of a dialed string before passing it to the remote telephony device. This reduces the number of digits that a user must dial to reach a remote location.
Use this procedure to add a number expansion set for a zone.
Prerequisite: You must specify number expansion rules for all number expansion sets added to the dial plan.
You must be in the Design View to add a number expansion set.
Expand the dial plan tree to view all components.
Select a zone to add a number expansion set to.
Click the Number Expansion Sets tab.
Right-click and choose Add from the menu. The Add Number Expansion Set dialog box appears.
Enter the name of a number expansion set. The maximum value is 64 characters.
Click Apply to apply the values and add the number expansion set.
Click Cancel to cancel the procedure.