You can check DNS response.
I think there may be a set flag that indicates "partial response."
In this case, the client should switch transport used to send requests from UDP to TCP.

As I know Freewithch (libsofia) do not support DNS request via TCP and this lead to failed DNS lookup.


On Fri, Dec 10, 2021 at 8:10 PM Brian : <brians@iptel.co> wrote:
We noticed something similar with 1.1.1.1 and srv records a while ago. Didn't spend much time on it just told customer to use a resolver that works.

On Friday, December 10, 2021, Podrigal, Aron <aronp@guaranteedplus.com> wrote:
> Hi, 
> I am experiencing weird behavior.
> I have my nameserver set to 1.1.1.1, doing sofia_dig returns no results, one request out of five succeeds.
> - When I do a dig / host lookup directly outside freeswitch using 1.1.1.1, it works.
> - sofia_dig with any other DNS server (8.8.8.8, 9.9.9.9 etc) works.
> PCAP shows DNS traffic being sent and received normally. In the non working scenario, the response from 1.1.1.1 simply has zero  ips.
> See below.
>
> </mail/u/0/s/?view=att&th=17da4c1a164bfbe4&attid=0.0.1&disp=emb&realattid=ii_kwzyxhsx1&zw&atsh=1>
>
> --
>
> -
> Aron Podrigal
>
> _________________________________________________________________________

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