When you program the IPPhone 1150, in AST you must type the number of keys you want to be controled by the symposium, for example
key o acd 374xxxx o 374XYXY
key 3 scr 374YXYX
in this case AST must be AST 00 03
Remember the phantom is another DN , 374XZXZ with FTR CFW 7
Sorry for my grammar