application have only a Passive or Bridged TerminalConnection, all APIs on the call throw a PreConditionException (such as Call.Drop()). ???If there is more than one active TerminalConnection on a Shared Line, Call.drop() does not return in CallInValid in the following scenarios: ???In the case of a normal two party call between A and B, where A is a SharedLine with A' and A' has Barged into