Hi, I have manualy registrered a Snom C520 conference phone to our 3CX pbx. I had to do this manualy while the phone is not supported yet from 3CX. The registration is ok but I am facing the following problem; The phone starts ringing from time to time with no reason so it seems like. Now it looks like the ringing starts when the phone is registering or reregistering with the pbx. Any one know how we can solve this?