DSSKey to show Line Status

[Novais]

So this is going to be a bit of a newbie question but how would i be able to program the DSSKeys to display the outside line status from my Yeastar S20? I am using 4 FXO lines and i am sure the client will want a display status from each line.... I tried programming each Line as a separate key but lines 2-4 dont show, only Line 1. I can press the key and then the Line shows up but it picks up the next available outgoing line rather than its specific FXO port...