What I'm saying is if the OP is not having general broadband disconnections with his copper line but this is only happening with the phone ringing, picked up or connected and disconnected. Then Digital Voice will definitely solve the problem.
I didn't have general internet disconnection related to noise margin when I was with TalkTalk FTTC. But with TalkTalk FTTC only offering analogue phone line, I had this problem for 2+ years.
I then joined 13 months ago BT FTTC Home Essentials 2 with Digital Voice. During the signup process I was given 2 options. To remain on analogue or to switch to the new Digital Voice service and I'll receive an Advanced Digital Home Phone with Alexa built in.
I opted for Digital Voice and received this new Digital Home phone along with Smart Hub 2 router. The phone is wireless and only needs to be registered to the router once by pressing the WPS button on the router.
As soon as I migrated from TalkTalk to BT 13 months ago I noticed that plugging and unplugging the traditional analogue phone wasn't causing internet disconnection! I then checked for dial tone and noticed that it was silent.
This indeed meant that the transition to digital voice from analogue is actually what solved the problem for me. This naturally resolved my disconnection problems because as soon as I tested by calling my own landline phone number with my mobile phone the internet connection was not interrupted! I did several tests to confirm that this wasn't just exceptionally not occurring.
Well I had a similar problem several years ago but with ADSL: the BTw connection was for both PSTN voice and broadband, when the phone rang the broadband would drop sync but otherwise the ADSL SNRM etc. was fine. Eventually the problem was solved when I migrated only the ADSL to TalkTalk Business, kept the PSTN BTw voice and thus had a SMPF service. Doing this cured my problem but I would certainly not claim that would have been a solution in all cases.
Your moving from TalkTaik FTTC to BT retail FTTC (leaving aside the change from PSTN to DV) may have had a similar effect?
My problem with ADSL was much more serious as I was formerly Exchange Only Line. Not only was my phone causing the internet to disconnect, but I also had problems with SNR where it would drop to 0dB causing internet disconnection almost every day. My solution at that time was to cap my noise margin to 9dB.
This was a problem that affected at that time everyone in my area. I spoke to many neighbours hence, why I kept pushing my management for FTTP back in 2014-2015 but wayleave at that time was rejected.
Luckily Openreach upgraded our area to FTTC from EO Line in October 2019! The general internet disconnection problems were completely resolved. I mean now my internet connection is stable even with a 3dB noise margin profile. It used to be 6dB but due to crosstalk it dropped to 3dB. Anyway, I fully sync at 80/20Mbps so my connection speeds are stable.
I regularly check router stats and I see my connection is stable (no drop outs). Only when phone rang or when I picked up the phone the connection losing sync would occur. The same would apply if I unplugged the phone line from the master socket and re-plugged it.
FTTC partially resolved the problem with unplugging and replugging due to the new NTE5c MK4 Faceplate since the micro filter is included as part of the face plate. But the ongoing problem persisted until my migration to BT.
The thing is in the past I spoke to Openreach and had an engineer come but they were never able to fix the problem.
But yes, I'm glad that with Digital Voice the problem is gone now.
This indeed meant that the transition to digital voice from analogue is actually what solved the problem for me.
I would say you have masked the issue (by moving to DV) rather than solved it.
You're right, I've only masked the issue rather than fixing the underlying problem. But nevertheless, I'm still relieved that Digital Voice doesn't cause this problem. Ringing home landline number doesn't cause connection drop outs.
As long as it is no longer causing the drop out, I have nothing to worry. For me "if it ain't broke, don't fix it". As long as it is not causing me a problem, I don't need this underlying fault fixed since my general broadband connection is now rock stable.
That is why I posted my experience to reassure the OP that his problem will naturally be resolved with DV.
Frankly, by the end of December 2025 when analogue gets retired and DV becomes the new default, I'm sure many people will have had the problem naturally disappear. Many of them I'm sure will still have the underlying fault, but they won't even know that the problem exists! It will be masked but it won't be causing any of us problems.
Not to mention that by then most of us will either have Openreach FTTP or another Altnet FTTP network. Just like now I have Community Fibre available. I'll soon switch to Community Fibre and this FTTC service will be something I can ignore for good. Obviously it could be handy for future.