OUTLOOK CLICK TO CALL
Using SIPTAPI, it is possible to call contacts directly from Outlook 2013.
Instructions for installation
To get started, first download and configure the SIPTAPI program here
Instructions for use (Outlook 2013)
Firstly go into contacts and highlight the contact you want to call.
Right click on the contact.
Select call in the context menu and select the number to be dialed.
The new call dialogue will open, click the start call button.
Your phone should ring, answer it and the other party will be called.