branded as a Xen Master here in Australia
handset programming if PSTN lines
find the extensions port number first in - feature 65 from any handset
get into programming-
feature, conf , #0* , 8974
line key 4, 4-01, press * key to get cursor to first 01 on lcd screen, enter your port number you found in feature 65,
any line that is ringing will be lit a soft yellow/light green colour. and line that is on delayed ring will be lit red, any line not assigned to ring will be blank ( on the line keys on the handset )
press which line key to ring to change it to yellow/green
press transfer key
lift hand piece and replace