Here is a video on how to use our desk phones. I'm sure St Basil's have changed or disabled some of the options but the but the basic functionality is the same

Some people have portable handsets.

Here are 2 videos showing you how to use them..

The first is a general overview. It differs slightly from ours but still pretty close. I notice the place for the headset is on the left side of the phone rather than the bottom as indicated.

The second shows you how to set up contacts.