You can forward calls to another number or Teams member, or ring another number at the same time as your work number.
Set up call forwarding
Note: Call forwarding is only available in one-on-one calls.
To start forwarding your calls, select Settings and more 
next to your profile picture at the top of Teams. Then select Settings > Calls 
.
Under Call handling and forwarding, select the toggle to choose how all call forwarding should be handled, or set up different responses for different scenarios. You can choose to have calls forwarded to voicemail, to a new number or specific contact, a call group, or your delegates.
Tip: Learn how to set up a delegate and forward your calls to other people or groups.
Note: If you don't see any options for call forwarding in your settings, it's likely that you don't have an Enterprise Voice or Business Voice license. Also note that it can take up to 24 hours for changes in licenses to take effect.