Lectrician
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So when you say a line isn't working, I assume you mean extension?
Does swapping phones make a difference?
The versatility system requires 2 pairs for a featurephone. A master phone socket is recommended, as this allows SLT phones to be used aswell as featurephones, however, a featurephone will work equally with a secondary point.
In the main CCU, each extension port has a set of terminals - ABCD. These correspond to 2516 at your socket.
A and B are a pair (of the twisted phone cable), and carry analouge voice to terminals 2 and 5. C and D carry DATA for the screen and one touch keys etc, and connect to terminals 1 and 6 of your socket.
Can you connect a new master socket to the CCU temporarily with a short length of cable to test the CCU's extension port? This will rule out cabling issues. This would be the first thing to do as this does not sound like a programming issue.
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