Hi Jake,
Unfortunately, this is working as expected :(
That is why you can't find any settings to change to prevent this. Have a look;
Initiating a Meet-Me Conference Bridge
Meet-me conferences require that a range of directory numbers be allocated for exclusive use of the conference. When a meet-me conference is set up, the conference controller chooses a directory number and advertises it to members of the group. The users call the directory number to join the conference. Anyone who calls the directory number while the conference is active joins the conference. (This situation applies only when the maximum number of participants that is specified for that conference type has not been exceeded and when sufficient streams are available on the conference device.)
When you initiate a meet-me conference by pressing Meet-Me on the phone, Cisco CallManager considers you the conference controller. The conference controller provides the directory number for the conference to all attendees, who can then dial that directory number to join the conference. If other participants in a meet-me conference press Meet-Me and the same directory number for the conference bridge, the Cisco CallManager ignores the signals.
The conference controller chooses a directory number from the range that is specified for the conference device. The Cisco CallManager Administrator provides the meet-me conference directory number range to users, so they can access the feature.
**A conference continues even if the conference controller hangs up.**
From this 4.1(3) doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803edae2.html#wp1022209
This is still applicable with CCM 5.0(2);
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008062ad70.html#wp1022209
If this is a concern, perhaps you should look into Cisco Unified MeetingPlace Express which has some good features like "End Meeting" and;
Cisco Unified MeetingPlace Express has the following security features:
In-session meeting controls-Meeting owners can change Web conferencing permissions, specify announced entry and departure, require passwords, lock the meeting, and eject unwanted attendees.
Meeting administrators have a rich tool set in Cisco Unified MeetingPlace Express including:
Meeting configuration-Capacity management, overbooking, maximum and default meeting sizes, maximum and default meeting lengths, meeting ID guard times, meeting extension, meeting warnings, minimum meeting password length, advance scheduling limit, meeting and recording purging, minimum meeting ID length, vanity meeting IDs, and reservationless parameters
From this doc;
http://www.cisco.com/en/US/products/ps6533/products_data_sheet0900aecd8056d53d.html
Hope this helps!
Rob
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