701, 702, 703... Are all the default line numbers assigned for trunks. The system should've defaulted a 24b Layout for the buttons on the phones. I think it puts lines 1,2,3,4 on the top row of the 8 button section right under the display, then goes from there. DT will assign a button a line, ex: DT701 assigns line 1 to a button. The reason it's ringing into just 1 phones is because the operator group is defaulted to just having one extension in it. Must add the other extensions into the operator group 500.