Fix for OBiTalk 404 error

[NOBi]

I've had an issue with OBiTalk calls responding with a 404 error ("rejected by the service provider - reason 404"), while the echo test (**9222222222) works fine.

Others have had the same issue as well...
https://www.obitalk.com/forum/index.php?topic=11976
https://www.obitalk.com/forum/index.php?topic=11985
https://www.obitalk.com/forum/index.php?topic=20391

Someone mentioned that it could be DNS related. Some ISPs and third-party DNS providers seem to be stripping out headers required for OBiTalk to respond. If anyone else has had this experience and knows more about this, please contribute.

The fix I found was to change the OBi DNS settings to Cloudflare:
SM/WAN Settings/Internet Settings/DNSServer1:=1.1.1.1
SM/WAN Settings/Internet Settings/DNSServer2:=1.0.0.1

Now, I have consistent service.