Is this affecting all calls? As described previously - not all calls. Friends and family and other numbers can work just fine - then the odd one gives nothing at all when we answer phone. The line is completely silent. We then do 1471 to find out who called and call them back.
Also just to clarify, do you have a DECT powered handset and can that just be attached to the fibre line without the adaptor? We are using a cordless Panasonic KX-TGD322 model which is DECT compliant. It plugs into a Burnside battery backup that VM installed as we need this for emergency use and from that it goes right into HUB3. What adaptor are you talking about??