Use case:

In a company, institute, or public administration with a work hierarchy, an employee will not be able to directly contact a "boss" if KalliopePBX's Boss/Secretary filter is active. Their call will be routed to the "secretary", the filter, who determines the availability of the manager. Instead, if the caller is another manager within the same company, they will be able to reach the "boss" directly upon dialing their number, without passing through any filters.