AT&T Spirit Communications System User Manual page 21

Add a Held Call to a Conference
Press CONFERENCE. Press button of call on hold.
Place a Conference on Hold
Press HOLD/PAUSE. To go back to the conference call, press any line or INTERCOM button
involved in the conference.
Drop a Line or Telephone from a Conference (Originator Only)
Press RECALL/DROP. Press line or INTERCOM button to be dropped. (Or, the person
hang up, leaving the other callers on the conference.)
End a Conference CaII
Originator of conference call hangs up. (The originator is the person who added the third person
to the call.)
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Conference