I've got broadband in my house, but having had the dreaded letter from sky telling me to connect up my second box, I'm having problems connecting my digibox and digital cordless phone to the same phone extension. Bottom line is that sharing in this way leads to line noise when using my phone. I've got a filter on each device, but the phone doesn't like being connected to the extension at the same time as sky. I've connected both filters to the extension by way of a splitter. Has anyone done this successfully? If so, how? I've read that filters vary wildly in quality so wonder if it's worth getting some new ones. Or is it just my phone? Help!