For the last few days we only get one ring on for incoming calls and then it stops. If you answer it quickly it connects fine, otherwise it hangs up. Master socket is an FTTC one but also have a copper work line (working fine). Outgoing calls are fine.
What I've tried:
Any ideas where problem might be and how to fix it (ideally without a £129 call out but accept it might come to that)?
Just for clarity, are you saying that you have a fibre to the premises (FTTP) line with FVA , fibre voice access , and this has the ring trip problem,and you also have a regular (copper pair) line that's ok ?
if that's the case, the normal checks are probably no help, and I would think you need the support of whatever company you pay line rental too for the FTTP 'line', presumably BT as you are posting here
If the problem line works fine in the test socket, but ring trips when the socket is reassembled then that would normally indicate a problem on the detachable panel itself or any wiring or sockets connected to that panel....it sounds as if you have a filtered panel, this normally means you don't need filters in any other sockets connected to the panel, but unlike a standard NTE5 consumer panel that doesn't gave any electronics in it, filtered ones do, and that could be where the problem is, you can get filtered panels easily., you could even ask your ISP to provide a replacement one
its a grey area who is responsible for the NTE5 panel, the consumer or Openreach, but it's hardly worth arguing over it as they are only a few £'s
I think there were blue and white wires connected and an orange one that appeared to be unconnected. Are the front panels easy to replace?
The wiring connected to the removable panel should run to an extension socket (s) , only 2 wires needed on terminal 2 and 5, pre broadband a third wire could be connected called the 'bell wire', but isn't needed and actually degrades ADSL, so you would disconnect this third wire to optimise your broadband speed if it were still connected.
you can get filtered or non filtered face plates on places like Ebay, Amazon etc, for a few ££'s, but I've seen posts where the ISP has sent out panels for free, if you call and say your broadband isn't working, or working poorly
if you don't use any extension sockets, you can remove the blue and white wires, and try reassemble the socket , if it starts working ok, it would prove the fault was on the cable or the extension socket the disconnected cable went to.
A common problem is extension wiring run under carpets near gripper rods , the gripper rod punctures the cable and puts a fault on, quite often it's 'ring trip'
TBH a damaged cable connected to the panel is more likely to be the problem than the panel itself, but the a filtered panel does have components, that could fail