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Teams Voice:
This lets you mae and receive phone calls in Microsoft Teams, either to other people in Teams or to regular phone numbers.
Teams Calls:
This is the calling area inside of Teams where you can see your contacts, recent calls, voicemail, and utilize a number keypad to place calls.
Teams Phone:
This is a physical desk phone that connects to Microsoft Teams, Letting you make and receive calls without using a computer or mobile app.