You can use stations with twelve or more programmable feature keys and three display lines as call center endpoints because these endpoints have enough buttons and display lines for call center operations. However, stations with fewer buttons and display lines cannot sequentially register to call center stations that have twelve or more buttons programmed and have three display lines.
Note:
The 1230 phone has enough buttons, but has insufficient display capability. Hence, using the 1230 station to sequentially register with a station that has twelve or more programmable feature keys and three display lines is not recommended if you want to use the highest two buttons to configure essential CC feature buttons such as login/logout and work mode selection.