You can assign extension numbers, trunk group access codes, and Loudspeaker Paging access codes to a Busy Indicator button.

The Busy Indicator button provides the attendant or the user with direct access to the extension number, the trunk group, or the paging zone.

The Facility Busy lamp indication for a Vector Directory Number (VDN) does not light when the VDN is being used. You can use the associated button to place a call to a VDN.