1. You can add more people to a conference call as necessary.
  2. In the Conversation window, locate the Participants pane.
  3. Click the Invite More People button.
  4. In the Invite by Name or Phone Number window, select the names of the contacts to invite to the conference call.
  5. Click OK.
  6. Skype for Business calls the contacts selected, and add them to the meeting.