CME 7.0.1 Default Software Conference Behavior

What is the default behavior of regular software ad-hoc conference in CME system, before we'd started to play with keep-conference command in the ephone or voice register pool modes?

SCCP:

Last participant is being removed once the conference softkey pressed
EndCall softkey just disconnects all the participants no matter if there are local participants left in the conference or not
Going on-hook works in the same way as EndCall does

SIP:

Conference remains active in any way

If there is Conference Hardware command issued in telephony-service mode sccp phones lose the ability of mixing streams localy and show up Cannot Complete Conference if you try to add a third participant in the call while there is no Conference Bridge configured.

SIP phones don't support MeetMe conferences. For sure they can participate, but can't organize one. They don't even have MeetMe Softkey.