Calliflower has three different security levels that you can have for your conference call.
An open conference has a shared conference code that all participants can dial in with. In this mode, you will not be able to see people's names in the meeting dashboard, but they will be able to call in and view the presentation as well.
A closed meeting has a conference code, as well as a unique PIN for each of your participants. This allows you to distinguish your participants in the meeting dashboard by name. Make sure that the unique PINs are NOT shared between participants.
A locked down call is the most secure conference call. It requires participants to enter both the conference code as well as the unique PIN that they are send individually.