I have a whole DS1 (upto 25 stations) programmed for interaction with an IVR. The 25 stations work fine but when I try to add number 26, the station is permanatley busy. If I status the station, it says that is is inservice/off hook but all the others are inservice/on hook. When I dial it, it is busy. Even though a duplicated this station from another station, what am I doing wrong?