We were converted over to digital voice in Oct 2021, no issues encountered and I have turned off both Call waiting and Voice messaging as these are not required.
The bigger issue behind this is, people will give up calling because they will think that there is no one there.
I have reported this as a fault in early November and so far had no reply at all from BT.
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this is not a fault as you actually have 2 phone lines with DV so you can make or receive 2 call at the same time
if this is causing you a problems go to DV phone then phone settings then line settings then call settings and change multi to single and that will fix your problem
You could try phoning CS 150 and see if you can get them to send you a essential DV phone
As at Jan 2022 I have been switched over to BT Digital. My friends and family notified to me that there is no engaged tone when they call me and especially when I am using the phone.
Called BT, didn't get any help and tried to fob me off!! Really, honest truth.
I said this is not good enough and not acceptable, the lady on the phone went away and came and said they will send me a free digital phone which should fix this, that's all she said! Received phone, still same problem! Googled problem and came upon this post which has helped me. There are no instructions anywhere to fix this problem. You can't even change this on your BT Account under digital voice. You have to go in to the digital phone Menu/Phone Settings/Line Settings/Call Settings and Call Mode should be Single call and not Multi Call. This will restore the engaged busy tone.
The thing is, you need a digital phone to enable this.
We also had this problem and it was resolved by setting the new DV HD phone to a singe line and not multiple (default setting).
You need to do this on all of your DV phones, information for this is in the guide page 25 (Call Mode).