Just installed a Partner R7 509 at a customer site. They have a 2 line rollover hunt. If line 1 is busy it rolls over to line 2. When you go to answer line 2, you hear a tone (da, da, daaaaaaa) and the caller gets hung up on. Has anyone had this problem before? I disconnected everything from BellSouth's dmark and tested with a couple of buttsetts, and I could replicate the problem. Any ideas?