VOIP has died now
It's been working fine for months. Yesterday I changed the No Answer Time from 10 to 20 seconds. May or may not be coincidental, but the phone hasn't worked since. Calls to our landline from a mobile beep a couple of times and drop; outbound calls do similar.
In the router "Telephone Numbers" page there's a grey circle with a cross — VoIP isn't registering. Router log says "every IP of the domain has been tried, but we didn't find the correct one!" — retrying every 30s, all failing.
IDNet support has asked me to delete and re-add the config, done that (and rebooted), no change.
A few other things I've checked:
DNS resolves sbc.insmartcloud.com to 83.137.183.171 consistently (AdGuard and Google resolvers both return the same single IP, no failover).
Ping to that IP gets nothing back — but I know that might just be ICMP filtering at the SBC.
Checked from another UK line on a different ISP — same ping timeout.
check-host.net shows the IP unreachable from 54 global test nodes (again, could just be ICMP filtering).
Tracert dies at Cogent (149.14.250.234) before reaching the destination network.
The IP belongs to DRD Communications plc / QUDO platform (ASN 34967), not IDNet directly — I'm guessing it's their wholesale VoIP upstream.
Internet is otherwise fine.
Anyone else seeing this, or any ideas what to try next?
Emailed IDnet support which is pretty much pointless in recent years. Pretty much at the "have you tried turning it off and on again " phase

just did a similar post on the IDnetters forum to see if get any help there. But my router isn't getting a reply from THEIR services
EDIT:
I changed Bound Interface: from LAN to ANY_WAN and connected right away.

I never even changed that setting
