Hopefully this has not been asked already, but if so, point me in the right direction. I am bringing up CCM 5.1 for the first time along with activating Presence. I have it all working, but the odd thing I find is that when phone A goes off-hook and the BLF/SD button on phone B turns red (as it should), the primarly line button on phone B also turns red. Is this normal? One would think not. Please advise.