Back in the days, where it was normal to work from the office, colleagues could easily see when you were not available because you are on the phone or maybe in a meeting room. This can be challenging when working from home. Below a Microsoft Teams status etiquette, from my point of view, on how to read the status:

I’m curious on your thoughts, is this something you are already using?
Let me know in the comments below!

For now, 
Thanks for reading! 

Kind regards and Stay Healthy, 
Mitchell Bakker