My 2766VAC has been my primary router (FTTC) since I bought it a couple of years ago.  Towards the end of last year I switched ISPs which meant moving to digital voice (from copper).  Despite telling Sky I would be using my own router, they didn't flag they don't support digital voice on 3rd party routers.

My Draytek works without issue but I need to reinstate my digital landline.  I've tried setting up my Draytek as a Access point (https://www.draytek.co.uk/support/guides/kb-router-as-ap) - disabling DHCP on it, ensuring it's on the same subnet at the Sky router & then connecting both via a LAN port.  However the Sky router appears to be issuing an internet IP address despite the DHCP IP range being 192.168.1.x/24.  When I give the end points static IPs within the DHCP address range, DNS resolution fails.  I've tried specifying the Draytek, the Sky router & external DNS (Google) all of which fail.

Has anyone been able to setup a similar Draytek with a sky router successfully & if you have, how did you do it please?

This is an issue I face also.  I far as I am aware the issue is that Sky will use their own means of encoding the VOIP strream so thiird party VOIP routers will not work.  If I am wrong, please let me know, as I mourve the loss of my land line.  But I value the subnetting and VLANs I can configure with my Draytek more than the landline.  I am not sure it is possible to dissociate the landline from sky and have that handled by  separate company.  Probablly not.