To make a call from the directory:
1.Using the 
Directory gadget on the Main tab, locate the name that you require in the directory.
2.To filter the names shown, start entering a name or number in the text box at the top of the tab. As you enter a name, directory contacts that do not match are hidden from the view.
3. To call the contact shown, hover your cursor over it. The directory icons for the directory functions you can perform are displayed.
4. To make a call to the contacts primary number, click on the 
call icon. If a 
icon is displayed, you can click on this to display the contacts alternate numbers and click one of those numbers for the call.
• Alternate Numbers:
If this icon is displayed, the contact has alternate numbers. You can click the icon and select the call options available for those numbers.
•The progress of the call is displayed on a tab in the 
Calls gadget. If the call fails, the gadget displays a reason for the failure if known.
•When calling an internal user, if they do not answer you can set a ringback to call you when they end their current or next call.