It doesn’t due to potential echo but you can set this up yourself with most headsets or with a mic and mixer; you need to with headphones that shut out your voice or you will shout to compensate.
I tend to put my headphones on only halfway, also to catch anything going on in the background (noise cancelling headphones + my back is to the bedroom door).
It's pretty awkward to wear only one ear of my Bose headphones, but with earbuds it works great. Apple's are the least bad solution I've ever found for voice calls.
I have open back headphones that I use at home (can't use at the office because too much sound bleed), and they are great for video calls because of this since they let in the sound of my own voice.
