Is this driven by Openreach or by BT and by Openreach will all ISPs using the Openreach infrastructure be forced to adopt it?
The reason for my question is could I avoid adopting it by switching to another ISP?
It is being driven by openreach and all isps will need to change to voip
The reason for this, is explained on this two page website.
https://www.draytek.co.uk/information/blog/the-end-of-analogue-phone-lines-pt1
The PSTN equipment in the exchanges is well past its useful life, and is very expensive to maintain.