All the landline traditional phone jacks worked with Fios. Now I switched to Comcast and none work. I've read all BruceW threads about simply plugging directly from modem, and using Y splitter. I have had 2 techs here (plus install so that's 3) and no one knows what to do. I need these jacks operational for medical devices in certain locations in house. Can anyone please help before I need to switch back to Fios? Thanks.