I have an Elite 192 that I had a local shop program for me. I use three of the buttons on a DTU-16 to dial an outside line. We have three CO lines but the third one is for future and has no dial tone (CO) connected. When I select one of those three buttons it will try to dial that number on CO3. Where in the SAT can I change that to dial on CO1 first?

Also is there a description of what the memory blocks 9-4-01, 9-4-02 and 9-4-03 are? The manuals I have do not go that far.