Apologize for newbie like question here, but I have 39XX phones I would like to add an extension to. The phones already have 2 extensions on Keys 0 & 1 assigned. When I assign to keys 2 & 3 using SCR, when that extension rings, the user must hit shift, then choose the line in order to answer it. What am I missing here, they should just be able to pick up the handset to answer, right? Any help would be greatly appreciated.