BT IPv6 DNS cannot resolve Microsoft Support domain (breaks Windows Get Help app)

[WSH]

@CanardNoir  I'm not aware of any solution that allows you to put your own router before the SH2.

Licquorice's idea looks interesting.

[licquorice]

There is but it is extremely convuluted 

https://forum.openwrt.org/t/bt-digital-voice-and-3rd-party-routers/142125

[CanardNoir]

@WSH 

@licquorice 

I was thinking:-

VDSL2 Modem → My Router → Smart Hub 2

I could turn the Smart Hub 2 into a “Digital Voice adapter”:
• Wi‑Fi off
• DHCP off
• No routing
• No NAT
• No DNS
• Just a phone plugged into it

My own router would handle:• IPv6
• DNS
• DHCPv6‑PD
• Wi‑Fi
• IoT
• Everything else

Of course, this assumes the Smart Hub 2 only needs a working internet connection to register the phone service.

Your opinion would be valued.

[licquorice]

Nope, doesn't work unless you employ the convoluted method I posted earlier. 

The hub needs to be first router connected to line.

[WSH]

No, won't work, as I said before.

The only other alternative is to dump DV altogether and go with a third-party VoIP provider.

[Kimberlin]

@CanardNoir 

I have to ask, how important is the landline?

[CanardNoir]

@Kimberlin 

Very important I'm afraid.

There is almost no mobile signal in the area and I have medical equipment connected to the line.

[Katie_B]

Hi @CanardNoir. 

I have sent you over a private message to gather more information. 

Katie

[CanardNoir]

@Katie_B 

Thank you. Done that.

[WSH]

@CanardNoir   Having just had a chance to look at this properly, I can confirm that if the individual device is correctly set to use an IPv6 DNS other than BT it works fine.  This is a Windows 11 machine set to use Google’s public IPv6 DNS.