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BT Synergy second hand problem?

We have been given a synergy 2150 telephone set, second phone says on screen NOT SUB, what can we do to make this second hand set work or should we get rid?
Martyn, January 2005
http://www.bt.com/userguides/downloads/Synergy2150.pdf

pages 48 & 41 (written on bottom of page rather than pdf page number)

ANZAC, January 2005
link Click here to see other fixes for BT.