To make a call, click the phone headset icon located on the left side

When making a call, you have the option to call either through your phone or through your computer. 

    use this drop-down box to choose the option that is best for you. 

        select My Computer OR the DMS Cisco 8845

        (the video may or may not come through)

Then dial the number you want to call. 

    (yes you can just use the persons extension)

If you don't know the persons extension, you can use the Search or dial a number field.

    just start typing in the name of the person and options will appear

        then chose the correct person 

In this example, I was searching for Andrew Cox

Then click or use your mouse to hover over  the correct persons name

    choose the calling (headset icon) or video calling (camera icon) that is beside the persons name