I also have a DECT phone system connected to a bedroom socket. Both broadband and phone worked OK. My telephone line is 6.1km long and there are two notorious joints.
On the 8th September my broadband stopped working. The Technicolor 582n router is connected to my master socket which is in the attic of my house where the line comes in. I have an ADSLnation filtered faceplate.
I tried another router, 585v7 I also removed the faceplate and tried a different filter plugged into the test socket . No broadband worked, but I did have a dial tone.
I reported the fault to Plusnet, and after they said there might be a line fault, I also rang the BT Indian call centre who tested the line, said it was OK , but as there was a bit of crackle they would send someone the next day. The line was tested with the faceplate removed.
The BT Openreach man came on 10th September afternoon, removed the faceplate, tested the line and confirmed that there was no broadband. His equipment showed that there was a fault about 1450m from my house at one of the notorious points. He went to the fault replaced the joint. When he returned he found that he had cleared the fault but that the broadband still did not work. He said that he was not a broadband specialist.
So I called Plusnet at first they could not send anyone as the BT fault reporting system was not working, subsequently they then said that they could not send anyone because there was an outstanding voice fault.
The BT.com/faults website showed that the fault had been fixed. At about 8.30pm on the 11th Sept I called BT to cancel the fault. They were going to ring back but never did, so I called again at about 10.30pm and cancelled the fault. I informed Plusnet.
On 12th September someone else from BT Openreach called and said he would come to my house in about 30 minutes. I said that I had a broadband fault. He duly arrived, looked at the router and pointed out that the Broadband light was on, with both phones plugged in.
He then proceeded to test my house wiring (without my explicit consent as I knew that this might incur charges). The conclusion was that the new phone has a ‘rectified loop’ fault which may have caused my problem . He said that I would be charged for the call out, but also said I should complain as it was a new BT supplied phone.
In the meantime Plusnet left a message on my voicemail to say that that there is an external fault on my line.
The irony of this is that for years I have rented a BT 706 phone so that I could the report the frequent line faults that I get, knowing that if there was a fault it must be due to their equipment not working.
My suspicion is that the broadband was working when the technician arrived because he probably conducted some remote tests which reset the test equipment at the exchange which re-connected the DSLAM to the line. Further I suspect that he knew that there was a rectified loop fault which he might be able to charge me for correcting if it was in my house.
Naturally I do not want to pay for the call out charge which was probably caused by BT supplying me with a faulty phone and their test equipment disconnecting the ADSL service. Further the BT technician worked on my home wiring without my explicit consent.