By default, When you are in a Teams video or voice call and somebody else calls you everything goes wrong.
You get muted and cant hear / speak to the person already in a call.
The new caller gets a ring tone and you are deafened by a ringer in your ear or PC speaker.
The fix is fairly simple. You can configure Teams to show busy when you are in a call. Then a new caller gets a busy message and you get a missed call notification if you are already in a conversation.
- Connect to your Microsoft Teams Admin Center.
- Go to Voice and select Calling policies.
- Then click on Global.
- Toggle on Busy on busy is available when in a call.