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To dial a number from Teams, go to Calls 
, click Dial a number, and then enter the number of the person you want to reach by using the dial pad. Then click Call .
Here are a few other ways to make a call:
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If the person you want to reach is in your contacts list, click Contacts, find the person you want to call, and then click Call .
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If you’ve called people before (or if they’ve called you), they’ll be in your call history. In History, select More actions 
to the right of the person’s name, then click Call back.
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You can also access your voicemail and call people from that list. In Voicemail, select More actions to the right of the person’s name, then click Call back.
To access your dial pad during a call, go to your call controls and select Keypad 
.