Each leader account is assigned to their own ‘conference room’, attendees can enter the room when they use an active conference ID (an ID is like a key to open the door to the room)
If a conference call is in-progress (people in the room) and attendees from the next conference call use their conference ID (key to the room) they will join the in-progress conference call.
To avoid this, a leader can lock the conference room which prevents attendees from the next conference call joining the conference,
How to lock a conference call
1. Click the padlock icon on the Live Call page, click the button again to unlock the conference
2. Enter *2 on your telephone keypad to lock the conference, enter the command again to unlock the conference