The 9640 supports 24 programmable call appearance/feature buttons with helpful LED lights to indicate status. The labels for 6 of these are displayed in the main display and can be controlled by the adjacent buttons to the right. You can use the up/down keys to scroll the display. You can also use the left/right keys to move through the button feature in pages of 6.
Functions can be assigned to the phone’s call appearance/feature buttons by your system administrator or by yourself using self-administration. However, you cannot replace call appearance buttons set by your system maintainer. There are features that the system maintainer can set that are not available to you to assign.