What do I need to do?

1) If you don't already have it, install Zoom and log in (use login with Google) 

2) Configure Zoom to Auto-start
Windows:  Open the Zoom application, navigate to Settings (gear icon), go to General, and check the box for "Start Zoom when I start Windows" and "Silently start Zoom when I start Windows".
Mac: Launch the Zoom application, then control-click on the Zoom icon in the Dock, hover over "Options," and select "Open at Login". 

3) Set Up Your Voicemail Greeting
Here is the documentation from Zoom on customizing your voicemail greeting, or you can watch my little 5-minute video.

4) Optional: Install the Zoom app on your mobile phone and log in. (Use login with Google) 
iPhone | Android