I have a 1A2 system in my home consisting of a 551C KSU along with a number of 2565 phones with 4A speakerphones. I thought I would like a simple single line phone to have near my sofa so I bought four 91B connecting blocks, 2 of which had a 652C jack wired into the block and 2 had the jack integrated into the block. When I hook up the 25-pair cable and the single line phone there is nothing in the single-line phone although the 2565 works fine. Any ideas? Or is the 91B not made for this purpose. If not, what is the jack on the board made for?

Bill