I managed to get the new handsets to work this afternoon by using the 'ADP' socket instead of the 'LINE' socket.
Looks like the Red/Green & Yellow/Black pairs are reversed internally within the early LDP-7016D's.
I recently purchased 3 additional LDP-7016D handset for our phone system, but have been unable to get them to connect (No power or display to the new handsets)
We inherited the system with the office and I don't know a lot about its history, however I have previously been able to add new...
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