If you are using a Yealink conference phone, you can add a Trine Teams user or phone call to a current conference call.

-    Select the People icon in the upper right of the call

-    Select the option to Add People

-    Enter a Trine email address to search and select a user or enter a phone number. Make sure you select the user or phone number to add it. 

  or  

-    After selecting the user, select the check in the upper-right of the following screen

-    You can add more people or select the button at the top to return to the call and call options