The tMirrorSourceLiFilterChanged event is generated when a parameter of a filter which is referenced by Lawful Intercept (LI),or a parameter of one of its entry has been changed. [CAUSE] This notification may be triggered only if LI filter lock has been overruled, and one of the following actions has been done: 1) a filter referenced by LI has been deleted. 2) one of the parameters (default action, scope) of a filter which is referenced by LI has been changed. 3) a filter which is referenced by LI has been overwritten. 4) new entry has been created for a filter which is referenced by LI. 5) an entry of a filter which is referenced by LI has been activated. 6) an entry has been removed from a filter which is referenced by LI. 7) an entry of a filter which is referenced by LI has been renumbered. 8) one of the parameters of an entry in a filter which is referenced by LI has been changed. [EFFECT] Since a filter which is referenced by LI (or its parameter) has been modified, the mirrored traffic may be changed.