AT&T SYSTEM 25 Manual page 142

This feature applies to Switched Loop Attendant Consoles only.
Forced Release drops all active parties from a call in which the attendant and one or more
other parties are connected. Non-active parties (such as calls on hold) are not disconnected.
Forced Release differs from Release in that Release separates the attendant from an extended
call or a conference call, but leaves the other parties connected; Forced Release completely
disconnects all active parties.
Forced Release
F o r c e d R e l e a s e 3-25