3CX includes a TAPI driver that will allow Microsoft Outlook 2007 to dial phone numbers directly from inside Outlook. The TAPI driver is installed when we install the 3CX Call Assistant software. After you have installed and configured the 3CX Call Assistant, launch Outlook. Open a Contact as shown in the following screenshot, make sure there is a valid phone number entered and click on the Call button:
Outlook is now set up to be able to dial a phone number using 3CX.