Replacing my old door entry phone

Hi Sparka,
thanks for your reply, this is indeed what I expected and I am waiting for the delivery of the 3399 as a replacement. Out of curiosity I am trying to figure out what the function of the 6th line (for the number 5 position). 6 lines come out of the wall and on the old 0208 system they are all connected as seen in the first photo of this thread. I suspect I just blank it off, but what was it for?
thanks
Andy
 
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