Vertical Communications 8412S - Manual (Page 113)

10.3.1 Accessing The Button Levels
The IB24X and IB48X DSS/BLF consoles have four levels of buttons,
quadrupling the consoles’ button capacity. The four buttons at the bottom
of each console allow you to select which button level is currently active.
To change button levels, press one of the buttons at the bottom of the
console. The leftmost button activates level 1, the next button activates
level 2, etc. A light beside the appropriate button lights to indicate which
level is currently active.
Large Screen Speakerphone Manual 10 – 7
GCA70–349 Using The Attendant Features