When canceling the consultation call to the third party on a conference call or when removing the third party in a previously established conference call, the service provider (and switch) can release the conference bridge and revert the call back to a normal two-party call. If this is the case, the call whose handle is passed (in an invocation of the function TSPI_linePrepareAddToConference) with hConfCall transitions to the idle state, and the only remaining participating call transitions to the connected state.