ok the kxtd is the easyest system to add ext to
1 when you look into the ext modual you will see 8 x socketts and run as bottom left (ext 109)to top left ext (112)
bottom right ext(113) top right(116)
on each plug there are 6 x holes
with the glass part face to the left & on the upper side of the plastic holder

the first & last holes are unused
the second & 5th holes are the digi pair it doesent matter which way round if you are useing a digi phone
the 3th & 4th holes are the annalog (single line or slt phone )
or is known on the system as a xdp port

as you can see eack port has 2 exts in it annalog on the inner & digi on the outside of it.
we will need to know what type of phone you are using with these ports but on the older phones these require all 4 wires (annalog & digi )to run
the newer only require 2 digi wires to run

hope this helps a bit


peter...