It may be desirable to prevent ad-hoc conferences from continuing if there are no internal users involved. This can be enabled for the whole system.
Procedure
Select System Settings.
Click System.
Select Drop External Only Impromptu Conference.
If enabled, when the last remaining internal user exits the conference, the conference is ended regardless of whether it still includes other external parties
If disabled, the conference is only ended when the last party exits the conference.
