If you are using digital sets, you can add as many extensions as there are LED's on the set using LD 11. If you are using an analog set, then you can only have one line appearance.
Hi
on a digital set you need to set up a spare key
LD 11
req...chg
type 2216
tn..x x x x (extn that needs DN adding to it)
echg yes
item key x scr xxxx ( DN number to be added)
<CR> back to req
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