Cisco 8832 User Manual page 43

Call a new conference participant, but do not add the participant to the conference. Wait
until the call is connected.
Press Swap to toggle between the participant and the conference.
If you create a conference, you can view the details of the last 16 participants who join the conference. You
can also remove participants.
While you are in a conference, press Show Details to view a list of participants.
(Optional) Highlight a participant and press Remove to drop the participant from the conference.