Just installed a used Medley phone system in an 8x16 format. We have 6 incoming CO lines. Lines 1-4 hook up to one 66 block, lines 5-6 hook up on the other. Lines 4 and 5 (on 2 different 66 blocks) will not access at all, and they worked fine when in straight POTS setup. That is one issue. The other is I can get 2 lines to ring to where I want them to ring, but the other lines will not. Any suggestions? Other than these initial problems, it seems to be a nice setup.