Set your call answering rules
To set your call answering rules, select Settings and more 
next to your profile picture at the top of Teams and then choose Settings > Calls.
Choose how you want Teams to handle your incoming calls in the section for Call answering rules.
Select Forward my calls if that's what you want to do. If you want simultaneous ring, click Calls ring me and select others under Also ring.
Choose what to do with calls that go unanswered under If unanswered.
