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Could be a faulty line card in the exchange, or something on the line distorting the data burst that is sent just before the ringing voltage is sent out. I would suspect the line card, but it would need someone to check on the exchange frame to prove it.
If it is the line card, then normally a change of EN (equipment number) is made.
Thats probably the best course of action at the moment. Openreach can send a Frame Technician with a caller display unit, to test on the last point of the MDF, with the line disconnected.
All of the exchange line cards are very old now, and the relays inside sometimes fail to switch correctly. This can result in loss of the tone data burst, or even loss of ringing current.
It would do no harm at this stage to raise a fault report, as there are usually Frame Technicians visiting most exchanges every day, and fault reports do take priority over any future dated provision work.
Finally got this reported, technician being sent to the exchange to have a look and should hopefully be sorted by the 4th Jan.
Lets hope they can find someone with a spare caller display unit to try on the frame. You can get an approximate idea with a phone in the monitor only position. A burst of data can be heard just before the first ringing cycle starts. I believe its just a 1200 Baud FSK burst.
Sometime it can be distorted by faulty broadband filters in the broadband equipment, or even something in the house wiring which is attenuating the tones.
Two Openreach technicians arrived at the house, unfortunately they checked everything from exchange to property and couldn't get the caller display working either. They did however fix another issue we weren't aware about, there was a battery contact issue located on top of one of the poles for the line.
They will be submitting that the Caller Display is still not working in their report but also want us to report it back to Consumer.
Best way to go forward? Contact CS tonight or proceed via the forum?
Did they request a change of EN (Equipment Number), that would eliminate the chance that the line card was at fault?
Caller display does seem to baffle some of the FTs.
You could ask one of the mods to follow it up for you.