Avaya J169/J179 IP Phone is a phone for business communications.
The phone supports line 96 buttons. The primary display of the phone provides 96 buttons that you can access by scrolling or paging using the Navigation Cluster. Optionally, the phone supports up to three button modules, and each button module displays 24 line buttons out of the 96 buttons.
For more information about Avaya J100 Expansion Module, see Using Avaya J100 Expansion Module for SIP in https://support.avaya.com/.
Avaya J169 IP Phone has a grayscale display, and Avaya J179 IP Phone has a color display.