Do you mean that you want to generate a deep link to the scheduling dialog?
If so, you can refer to the following link to add your phone number to your meeting invitation:
https://teams.microsoft.com/l/meeting/new?subject=Link Test&attendees=user1@Company portal .com,user2@Company portal .com&startTime=11%2F18%2F2020%2010%3A30%3A00&endTime=11%2F18%2F20%2010%3A30%3A00&content=tel:+55999999999
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