Your voicemail is another familiar tool for getting the most out of your calling experience in Teams.
Go to Calls 
> History and then select Voicemail in the upper-right. From here you can:
Review messages and transcripts from calls
Customize call rules
Record a greeting
Call anyone who's left you a message
Call someone back from your voicemail by selecting More actions 
next to their name > Call back 
from the call history list, or by clicking Calls 
under the contact Details on the right side of Teams.
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